| Cover | Apr. 19, 2022 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Apr. 19, 2022 |
| Current Fiscal Year End Date | --12-31 |
| Entity File Number | 001-39404 |
| Entity Registrant Name | Greencity Acquisition Corporation |
| Entity Central Index Key | 0001768910 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Address, Address Line One | 505 Eshan Road, Floor 6 |
| Entity Address, Address Line Two | Pudong New District |
| Entity Address, City or Town | Shanghai |
| Entity Address, Country | CN |
| Entity Address, Postal Zip Code | 200120 |
| City Area Code | 86 |
| Local Phone Number | 21-20257919 |
| 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 | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Units, each consisting of one ordinary share. par value U.S. $0.0001 and one redeemable warrant to purchase one-half ordinary share |
| Trading Symbol | GRCYU |
| Security Exchange Name | NASDAQ |
| Ordinary Shares, par value U.S. $0.0001 | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Ordinary Shares, par value U.S. $0.0001 |
| Trading Symbol | GRCY |
| Security Exchange Name | NASDAQ |
| Redeemable Warrants | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Redeemable Warrants, each warrant exercisable for one half ordinary share |
| Trading Symbol | GRCYW |
| Security Exchange Name | NASDAQ |
