Document and Entity Information
12 Months Ended
Dec. 31, 2017
Document And Entity Information [Abstract]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2017
Document Fiscal Year Focus 2017
Document Fiscal Period Focus FY
Trading Symbol QD
Entity Registrant Name Qudian Inc.
Entity Central Index Key 0001692705
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Filer Category Non-accelerated Filer
Entity Common Stock, Shares Outstanding 325,838,455