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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Contract Balances (Details) - CNY (¥)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Changes in the Group's contract liabilities (advances from customers and deferred revenue)
Contract liabilities, beginning balance	¥ 73,901,130	¥ 60,718,426
Cash received in advance, excluding VAT	2,118,016,702	2,852,443,422
Revenue recognized from opening balance of contract liabilities	(62,471,630)	(50,024,734)
Revenue recognized from contract liabilities arising during current year	(2,055,218,506)	(2,789,235,984)
Contract liabilities, ending balance	¥ 74,227,696	¥ 73,901,130

X

- Definition

The amount of cash received in advance, net of VAT.

+ References

No definition available.

+ Details

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Namespace Prefix:	niu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of revenue recognized from opening balance of contract liabilities.

+ References

No definition available.

+ Details

Name:	niu_ContractWithCustomerLiabilityRevenueRecognizedFromOpeningBalance
Namespace Prefix:	niu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_ChangeInContractWithCustomerLiabilityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130532-203044

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration