The utility model discloses an antitheft bolt which comprises a stud. A check block is fixedly arranged at one end of the stud; the other end of the stud is provided with a screw thread section; a screw cap is screwed down on the screw thread section; a check block cover is sleeved on the stud, wherein a mouth part of the check block cover is toward the check block and the lateral surface of the check block and the end face close to the stud are coated by the check block cover; a screw cap cover of which a mouth part is arranged toward the screw cap is also sleeved on the stud; the check block cover is relatively in running fit with the check block; the screw cap cover can be relatively in running fit with the screw cap; the periphery of the screw cap is of a cone shape; at least two forward rotating clamping stations which can only push the screw cap to rotate forward when being pushed by an external force are arranged on the peripheral wall of the screw cap; and at least two reverse rotating clamping stations which can only push the screw cap to reversely rotate when bing pushed by an external force are arranged on the end face of the screw cap, which is far away from the check block. The antitheft bolt which adopts the structure has reasonable structure and low production cost, is convenient to use, has an antitheft function and is particularly suitable to use in the power or petroleum industry.