| Cover | Sep. 19, 2024 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 19, 2024 |
| Entity File Number | 001-42251 |
| Entity Registrant Name | YHN Acquisition I Limited |
| Entity Central Index Key | 0002020987 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Incorporation, State or Country Code | D8 |
| Entity Address, Address Line One | 2/F, Hang Seng Building |
| Entity Address, Address Line Two | 200 Hennessy Road |
| Entity Address, City or Town | Wanchai |
| Entity Address, Country | HK |
| Entity Address, Postal Zip Code | 00000 |
| City Area Code | +852 |
| Local Phone Number | 5499 8101 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Units, each consisting of one Ordinary Share, no par value, and one Right entitling the holder to receive one-tenth of an Ordinary Share | |
| Title of 12(b) Security | Units, each consisting of one Ordinary Share, no par value, and one Right entitling the holder to receive one-tenth of an Ordinary Share |
| Trading Symbol | YHNAU |
| Security Exchange Name | NASDAQ |
| Ordinary Share | |
| Title of 12(b) Security | Ordinary Share |
| Trading Symbol | YHNA |
| Security Exchange Name | NASDAQ |
| Rights [Member] | |
| Title of 12(b) Security | Rights |
| Trading Symbol | YHNAR |
| Security Exchange Name | NASDAQ |
