| Cover | 9 Months Ended |
| Sep. 30, 2021 | |
| Cover [Abstract] | |
| Document Type | S-1/A |
| Amendment Flag | true |
| Amendment Description | AMENDMENT NO. 2 |
| Entity Registrant Name | CEA Industries Inc. |
| Entity Central Index Key | 0001482541 |
| Entity Tax Identification Number | 27-3911608 |
| Entity Incorporation, State or Country Code | NV |
| Entity Address, Address Line One | 385 South Pierce Avenue |
| Entity Address, Address Line Two | Suite C |
| Entity Address, City or Town | Louisville |
| Entity Address, State or Province | CO |
| Entity Address, Postal Zip Code | 80027 |
| City Area Code | (303) |
| Local Phone Number | 993-5271 |
| Entity Filer Category | Non-accelerated Filer |
| Entity Small Business | true |
| Entity Emerging Growth Company | false |
