6-K

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OFFOREIGN ISSUER

Pursuant to Rule 13a-16 or 15d-16 of

the Securities Exchange Act of 1934

For the month of May 2021

Commission File Number: 001-15006

PETROCHINA COMPANY LIMITED

9 DongzhimenNorth Street, Dongcheng District

Beijing, The People’s Republic of China, 100007

(Address of Principal Executive Offices)

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

Form 20-F  ☒            Form 40-F  ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):  ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):  ☐

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes  ☐            No  ☒

(If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82—                )

EXHIBITS

Exhibit Number

SIGNATURE

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

EX-99.1

Exhibit 99.1

Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this document, make norepresentation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this document.

中國石油天然氣股份有限公司

PETROCHINA COMPANY LIMITED

(a joint stock limited company incorporated in the People’s Republic of China with limited liability)

(Stock Code: 857)

RESIGNATION OF SUPERVISOR

The board of directors (the “Board”) of PetroChina Company Limited (the “Company”) hereby announces that due to work arrangement, Mr. Li Wendong (“Mr. Li”) has tendered his resignation as an employee representative supervisor with effect from 28 May 2021.

Mr. Li has confirmed that he has no disagreement with the Board and the supervisory committee of the Company (the “Supervisory Committee”) during his term of office and there is no matter relating to his resignation that needs to be brought to the attention of the shareholders of the Company.

The Supervisory Committee would like to take this opportunity to thank Mr. Li for his contributions to the Company during his term of office as a supervisor of the Company.

Beijing, the PRC

28 May 2021

As at the date of this announcement, theBoard comprises Mr. Dai Houliang as Chairman; Mr. Duan Liangwei, Mr. Liu Yuezhen and Mr. Jiao Fangzheng as non-executive Directors; Mr. Huang Yongzhang as executive Director; andMs. Elsie Leung Oi-sie, Mr. Tokuchi Tatsuhito, Mr. Simon Henry, Mr. Cai Jinyong and Mr. Jiang, Simon X. as independent non-executive Directors