The utility model relates to a gun sleeve. The utility model solves the problems that the existing gun sleeve is not suitable for different length, the gun has easy collision when the gun is used by the left hand or the right hand, the buckle belt is nonadjustable and has easy breakage, etc. The utility model is characterized in that the bottom of a gun sleeve body is a through opening type; the central part of the gun sleeve body is provided with left and right symmetrical nylon hasps, and the interior of the gun sleeve body is provided with a U-shaped aluminum plate; a first buckle belt and a second buckle hasp respectively form a left bar shape and a left bar shape; a pack of five-surface claw male buckles and a pack of five-surface claw female buckles are arranged on the first buckle belt and the second buckle hasp; a nylon hasp is arranged below the first buckle belt and the second buckle hasp. The utility model is widely used for placing guns and protecting guns.