Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Apr. 28, 2020	Jun. 28, 2019
Cover [Abstract]
Entity Registrant Name	Cosmos Group Holdings Inc.
Entity Central Index Key	0001706509
Document Type	10-K
Document Period End Date	Dec. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Is Entity a Well-known Seasoned Issuer?	No
Is Entity a Voluntary Filer?	No
Is Entity's Reporting Status Current?	Yes
Entity Filer Category	Non-accelerated Filer
Entity Public Float			$ 0
Entity Common Stock, Shares Outstanding		21,536,933
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019
Entity Small Business	true
Entity Emerging Growth	false
Entity Shell Company	false
Interactive data current	Yes
Entity File Number	000-55793
Entity Incorporation State Code	NV