Permanent magnet stepping motor capable of self-checking rotor position

The utility model discloses a permanent magnet stepping motor capable of self-checking the position of a rotor, which comprises a motor main body and a base support, a rotor is arranged inside the motor main body, a first mounting rack is arranged outside the motor main body, two square grooves are arranged outside the first mounting rack, a bidirectional threaded rod is movably arranged outside the first mounting rack, and a permanent magnet is arranged on the base support. Two movable blocks are movably arranged outside the two-way threaded rod, clamping parts are installed outside the movable blocks, an adjusting rod is installed outside the motor body, a gear is installed outside the adjusting rod, and a second installation frame is installed outside the base support. The two-way threaded rod is rotated to drive the two movable blocks and the clamping part to be tightened and opened, sensor bodies of different specifications can be clamped conveniently, meanwhile, the sensing shaft penetrates through the