UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 UNDER

THE SECURITIES EXCHANGE ACT OF 1934

For the month of August 2025

Commission File Number: 001-39407

Li Auto Inc.

(Registrant’s Name)

11 Wenliang Street

Shunyi District, Beijing 101399

People’s Republic of China

(Address of Principal Executive Offices)

Indicate by check mark whether the registrant files or will file annualreports under cover Form 20-F or Form 40-F.

Form 20-F x      Form 40-F ¨

EXHIBIT INDEX

SIGNATURES

Pursuant to the requirements of the SecuritiesExchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: August 1, 2025

Exhibit 99.1

Li Auto Inc. July 2025 Delivery Update

BEIJING, China, August 1, 2025 — LiAuto Inc. (“Li Auto” or the “Company”) (Nasdaq: LI; HKEX: 2015), a leader in China’s new energy vehiclemarket, today announced that it delivered 30,731 vehicles in July 2025. As of July 31, 2025, Li Auto’s cumulative deliveriesreached 1,368,541.

The Company officially launched Li i8, a six-seatbattery electric family SUV, on July 29, 2025, and expects to begin deliveries on August 20, 2025.

As of July 31, 2025, the Company had 535retail stores in 153 cities, 527 servicing centers and Li Auto-authorized body and paint shops operating in 222 cities. The Company alsohad 3,028 super charging stations in operation equipped with 16,671 charging stalls in China.

About Li Auto Inc.

Li Auto Inc. is a leader in China’s newenergy vehicle market. The Company designs, develops, manufactures, and sells premium smart electric vehicles. Its mission is: Createa Mobile Home, Create Happiness (创造移动的家,创造幸福的家). Throughinnovations in product, technology, and business model, the Company provides families with safe, convenient, and comfortable productsand services. Li Auto is a pioneer in successfully commercializing extended-range electric vehicles in China. While firmly advancing alongthis technological route, it builds platforms for battery electric vehicles in parallel. The Company leverages technology to create valuefor users. It concentrates its in-house development efforts on proprietary range extension systems, innovative electric vehicle technologies,and smart vehicle solutions. The Company started volume production in November 2019. Its current model lineup includes a high-techflagship family MPV, four Li L series extended-range electric SUVs, and one Li i series battery electric SUV. The Company will continueto expand its product lineup to target a broader user base.

For more information, please visit: https://ir.lixiang.com.

Safe Harbor Statement

This press release contains statements that mayconstitute “forward-looking” statements pursuant to the “safe harbor” provisions of the U.S. Private SecuritiesLitigation Reform Act of 1995. These forward-looking statements can be identified by terminology such as “will,” “expects,” “anticipates,” “aims,” “future,” “intends,” “plans,” “believes,” “estimates,” “targets,” “likely to,” “challenges,” and similar statements. Li Auto mayalso make written or oral forward-looking statements in its periodic reports to the U.S. Securities and Exchange Commission (the “SEC”)and The Stock Exchange of Hong Kong Limited (the “HKEX”), in its annual report to shareholders, in press releases and otherwritten materials, and in oral statements made by its officers, directors, or employees to third parties. Statements that are not historicalfacts, including statements about Li Auto’s beliefs, plans, and expectations, are forward-looking statements. Forward-looking statementsinvolve inherent risks and uncertainties. A number of factors could cause actual results to differ materially from those contained inany forward-looking statement, including but not limited to the following: Li Auto’s strategies, future business development, andfinancial condition and results of operations; Li Auto’s limited operating history; risks associated with extended-range electricvehicles and high-power charging battery electric vehicles; Li Auto’s ability to develop, manufacture, and deliver vehicles of highquality and appeal to customers; Li Auto’s ability to generate positive cash flow and profits; product defects or any other failureof vehicles to perform as expected; Li Auto’s ability to compete successfully; Li Auto’s ability to build its brand and withstandnegative publicity; cancellation of orders for Li Auto’s vehicles; Li Auto’s ability to develop new vehicles; and changesin consumer demand and government incentives, subsidies, or other favorable government policies. Further information regarding these andother risks is included in Li Auto’s filings with the SEC and the HKEX. All information provided in this press release is as ofthe date of this press release, and Li Auto does not undertake any obligation to update any forward-looking statement, except as requiredunder applicable law.

For investor and media inquiries, please contact:

Li Auto Inc.

Investor Relations

Email: ir@lixiang.com

Christensen Advisory

Roger Hu

Tel: +86-10-5900-1548

Email: Li@christensencomms.com