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

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- 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

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