Rifle bullet throwing opening protection device

The utility model discloses a rifle bullet throwing opening protection device which comprises a fixing device, the fixing device comprises two inverted-U-shaped fixing rings which are parallel to each other, and the opposite end faces of the two inverted-U-shaped fixing rings are connected through a first connecting plate. The protection device further comprises a guide assembly, the guide assembly comprises a second connecting plate, and the two ends of the second connecting plate are connected to the two inverted-U-shaped fixing rings respectively. A guide assembly is connected to the side, away from the inverted-U-shaped fixing ring, of the second connecting plate, a cartridge case inlet and a cartridge case outlet are formed in the guide assembly, the cartridge case inlet is parallel to the second connecting plate, and a through hole communicated with the cartridge case inlet is formed in the second connecting plate; the cartridge case outlet is parallel to the bottom opening of the inverted U-shaped fixi