6-K

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 May 2026

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 annual reports 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 Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: May 12, 2026

Exhibit 99.1

Hong Kong Exchanges and Clearing Limited andThe Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement, make no representation as to itsaccuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the wholeor any part of the contents of this announcement.

Li Auto Inc.

理 想 汽 車

(A company controlled through weighted voting rights and incorporatedin the Cayman Islands with limited liability)

(Stock Code: 2015)

Date of Board Meeting

The board of directors (the “Board”) of Li Auto Inc. (the “Company”, together with its subsidiaries and consolidated affiliated entities, the “Group”) hereby announces that a meeting of the Board will be held on Thursday, May 28, 2026, for the purpose of considering and approving, inter alias, the unaudited financial results of the Group for the three months ended March 31, 2026 and its publication.

The Company’s management will hold an earnings conference call on Thursday, May 28, 2026, at 8:00 A.M. U.S. Eastern Time or 8:00 P.M. Beijing/Hong Kong Time on the same day.

For participants who wish to join the call, please complete online registration using the link provided below prior to the scheduled call start time. Upon registration, participants will receive the conference call access information, including dial-in numbers, passcode, and a unique access PIN. To join the conference, please dial the number provided, enter the passcode followed by your PIN, and you will join the conference instantly.

Participant Online Registration: https://s1.c-conf.com/diamondpass/10054648-why786.html

Hong Kong, May 12, 2026

As of the date of this announcement, the boardof directors of the Company comprises Mr. Li Xiang, Mr. Ma Donghui and Mr. Li Tie as executive directors, Mr. WangXing and Mr. Fan Zheng as non-executive directors, and Prof. Xiao Xing, Mr. Zhao Hongqiang and Mr. Jiang Zhenyu as independentnon-executive directors.