Abstract: A shooting mechanism of an anti-violence gun, more particularly a shooting mechanism shoots spherical bullet body for deterrence through air pressure. The present invention mainly comprises a barrel with a bore connected rearward; a tension spring is disposed inside the bore and expands a shuttle tube which has a high pressured air bottle loaded at the rear aspect thereof. Before using the gun, the shuttle tube is fixed by an insert cotter; after a lift-press plate releases the insert cotter, the air bottle rapidly withdraws toward the rear end of the bore and is punctured by a push needle disposed at a rear end thereof such that the high pressured air inside the high pressured air bottle reversely pushes and presses the spherical body thereby achieving an objective of shooting safely for deterrence.