The invention discloses an anti-theft gas ball valve which comprises a valve body. An anti-theft lock is mounted on the shell wall of the right side of the valve body, and an anti-theft lock hole is formed in the center of an inner cavity of the anti-theft lock. A gas inlet is formed in the lower right portion of the valve body, and a gas outlet is formed in the lower left side of the valve body.A valve rod is fixedly connected to side, close to the left portion, of the middle of the valve body, and the upper end of the valve rod is fixedly connected with a rotating wheel. The middle of the valve rod is engaged with a gear, and the lower end of the valve rod is fixedly connected with a spherical valve core. The right side of the gear is movably connected with a piston rod, and the right end of the piston rod is fixedly connected with a piston cavity. The left side of the piston cavity is provided with a piston, and the side, close to the piston cavity, of the upper end of the spherical valve core is provided with an elastic buckle. According to the anti-theft gas ball valve, through arrangement of the piston, the elastic buckle, the anti-theft lock, an anti-theft lock nut and thelike, the anti-theft property of the gas ball valve is greatly improved, the use difficulty of a worker is reduced, and meanwhile, the service life of the gas ball valve is improved.