A drum hoop fastening device is provided for being disposed on a drum. A first connecting portion is arranged on a drum hoop, an exterior circumferential wall of a drum shell has a second connecting portion, the first connecting portion has a first through hole, the second connecting portion has a connecting hole, and the drum hoop fastening device includes a fixing member and a fastening member. The fixing member is abutted against the drum, and has a second through hole. The fastening member is disposed through the first and second through holes and screwed with the connecting hole for fixing the drum hoop on the drum shell, and when the fastening member rotates, an exterior circumferential wall of the fastening member circumferentially interferes the fixing member.