The invention discloses an anti-theft ball valve which comprises a valve body (1), a valve rod (2), a valve element (3) and a handle (4), wherein the valve element (3) is arranged in the valve body (1); a hollow bulged neck (1.1) is arranged at the upper end of the valve body (1); the valve rod (2) is arranged in the hollow bulged neck (1.1); the lower end of the valve rod (2) is connected with the valve element (3); the handle (4) can be vertically and movably connected onto the valve rod (2) under the action of a return spring (5) and external force; a longitudinal limiting device capable of longitudinally limiting the handle (4) when the handle (4) is pressed downwards in a set position is arranged between the middle of the handle (4) and the valve rod (2); a circumferential locking device capable of circumferentially limiting the handle (4) when the handle (4) is pressed downwards in the set position is arranged between the handle (4) and the hollow bulged neck (1.1). The anti-theft ball valve is convenient to assemble, long in service life and low in production cost.