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Document and Entity Information
 12 Months Ended
Dec. 31, 2019
shares
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2019
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-38591
Entity Registrant Name Pinduoduo Inc.
Entity Incorporation, State or Country Code E9
Entity Address, Address Line One 28/F, No. 533 Loushanguan Road, Changning District
Entity Address, City or Town Shanghai
Entity Address, Postal Zip Code 200051
Entity Address, Country CN
Title of 12(b) Security American Depositary Shares
Trading Symbol PDD
Security Exchange Name NASDAQ
Entity Central Index Key 0001737806
Amendment Flag false
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Document Accounting Standard U.S. GAAP
Entity Emerging Growth Company false
Entity Shell Company false
Document Fiscal Year Focus 2019
Document Fiscal Period Focus FY
Business Contact [Member]  
Entity Address, Address Line One 28/F, No. 533 Loushanguan Road, Changning District
Entity Address, City or Town Shanghai
Entity Address, Postal Zip Code 200051
Entity Address, Country CN
Contact Personnel Name Jianchong Zhu
Contact Personnel Email Address investor@pinduoduo.com
Class A ordinary shares  
Entity Common Stock, Shares Outstanding 2,575,580,988
Class B ordinary shares  
Entity Common Stock, Shares Outstanding 2,074,447,700