| Cover | Jun. 09, 2023 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 09, 2023 |
| Entity File Number | 001-41474 |
| Entity Registrant Name | Hainan Manaslu Acquisition Corp. |
| Entity Central Index Key | 0001894370 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Address, Address Line One | B3406, 34F, West Tower, Block B |
| Entity Address, Address Line Two | Guorui Building, 11 Guoxing Avenue |
| Entity Address, City or Town | Haikou |
| Entity Address, Country | CN |
| Entity Address, Postal Zip Code | 570203 |
| City Area Code | +86 |
| Local Phone Number | 898-65315786 |
| 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, one redeemable warrant, and one right | |
| Title of 12(b) Security | Units, each consisting of one ordinary share, one redeemable warrant, and one right |
| Trading Symbol | HMACU |
| Security Exchange Name | NASDAQ |
| Ordinary shares, par value $0.0001 per share | |
| Title of 12(b) Security | Ordinary shares, par value $0.0001 per share |
| Trading Symbol | HMAC |
| Security Exchange Name | NASDAQ |
| Redeemable warrants, each warrant entitling the holder to purchase one ordinary share at a price of $11.50 per share | |
| Title of 12(b) Security | Redeemable warrants, each warrant entitling the holder to purchase one ordinary share at a price of $11.50 per share |
| Trading Symbol | HMACW |
| Security Exchange Name | NASDAQ |
| Rights, each right entitling the holder to receive one-tenth of one ordinary share | |
| Title of 12(b) Security | Rights, each right entitling the holder to receive one-tenth of one ordinary share |
| Trading Symbol | HMACR |
| Security Exchange Name | NASDAQ |
