| Cover | Sep. 07, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | false |
| Document Period End Date | Sep. 7, 2021 |
| Entity File Number | 000-54391 |
| Entity Registrant Name | SMG INDUSTRIES INC. |
| Entity Central Index Key | 0001426506 |
| Entity Tax Identification Number | 51-0662991 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 710 N. Post Oak Road |
| Entity Address, Address Line Two | Suite 315 |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77024 |
| City Area Code | 713 |
| Local Phone Number | 821-3153 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
