| Cover | Aug. 28, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 28, 2023 |
| Entity File Number | 000-55793 |
| Entity Registrant Name | Cosmos Group Holdings Inc. |
| Entity Central Index Key | 0001706509 |
| Entity Tax Identification Number | 90-1177460 |
| Entity Incorporation, State or Country Code | NV |
| Entity Address, Address Line One | 37th Floor |
| Entity Address, Address Line Two | Singapore Land Tower |
| Entity Address, City or Town | 50 Raffles Place |
| Entity Address, Country | SG |
| Entity Address, Postal Zip Code | 048623 |
| City Area Code | 65 |
| Local Phone Number | 6829 7017 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common |
| Trading Symbol | COSG |
| Entity Emerging Growth Company | false |
