Precise shaft core special for micro motor

The utility model relates to the technical field of micro motors, in particular to a special precise shaft core for a micro motor, which comprises a shaft core body and a motor rotor, a bolt rotating groove and a cross bolt are arranged in the shaft core body, an internal thread sleeve is arranged outside the cross bolt, a supporting rod is arranged on the internal thread sleeve, and one end of the supporting rod far away from the internal thread sleeve is rotatably connected with an arc-shaped supporting plate. Supporting plate containing grooves are formed in the positions, corresponding to the arc-shaped supporting plates, of the shaft core body. According to the utility model, the cross bolt in the shaft core body is screwed to drive the internal thread sleeve to slide through threads, the supporting angle of the supporting rod is changed to enable the arc-shaped supporting plate to slide vertically, the arc-shaped supporting plate is fixed against the inner wall of the motor rotor, and once the shaft cor