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MEMBER MANAGEMENT FEES PAYABLE - Additional Information (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Selling and Marketing Expense [Member]
Member management fees	¥ 174,798	¥ 418,194	¥ 876,769

X

- Definition

Represents management service fee related to marketing.

+ References

No definition available.

+ Details

Name:	yj_ManagmentServiceFeeExpense
Namespace Prefix:	yj_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_SellingAndMarketingExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: