Non-contact type silencer for gun

Provided is a non-contact type silencer for a gun. A silencer box body of the silencer is provided with an entrance port and an exit port. Inward flanges are arranged on the periphery of the entrance port and the periphery of the exit port. An expansion chamber is formed in the middle of the silencer box body. Silencer bowls are arranged between the inner wall of the expansion chamber and the inner wall of the silencer box body and are connected in a sleeving and overlapping mode. According to the non-contact type silencer for the gun, the distance between the silencer and the gun and the height of the silencer can be adjusted so that the non-contact type silencer for the gun can meet the demands of shooting of guns at various fixed positions. The non-contact type silencer is suitable for shooting use of various guns, and especially suitable for indoor shooting.