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Cover - shares
6 Months Ended
Jun. 30, 2021
Aug. 10, 2021
Cover [Abstract]    
Entity Registrant Name CAT9 Group Inc.  
Entity Central Index Key 0001632275  
Document Type 10-Q  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Small Business true  
Entity Shell Company false  
Entity Emerging Growth Company true  
Entity Current Reporting Status Yes  
Document Period End Date Jun. 30, 2021  
Entity Filer Category Non-accelerated Filer  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2021  
Entity Ex Transition Period false  
Entity Common Stock Shares Outstanding   102,166,400
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Entity File Number 333-222288  
Entity Incorporation State Country Code DE  
Entity Tax Identification Number 47-2912810  
Entity Address Address Line 1 Room 2001, Dading Century Square  
Entity Address Postal Zip Code 610000  
Security 12b Title Common  
Trading Symbol CATN  
Entity Address Address Line 2 No 387, Tianren Road  
City Area Code 86  
Local Phone Number 028-85594777  
Entity Address Address Line 3 Wuhou District  
Entity Address City Or Town Chengdu  
Entity Address Country CN