Device and method for disassembling neck bush

The device comprises a pull rod, a fixing module and a supporting module, the fixing module is installed at one end of the pull rod, the supporting module is installed at the other end of the pull rod, and the pull rod pulls the neck bush out of a bearing seat tube through the fixing module. The supporting module connects the pull rod with the bearing seat tube and is used for supporting the pull rod; the fixing module comprises a positioning sleeve, a sliding block and a sliding claw, the positioning sleeve is installed in the middle of the sliding block, the pull rod is sleeved with the positioning sleeve and the sliding block, the sliding block is pushed to one end of the pull rod through the positioning sleeve, the sliding claw is installed on the side face of the sliding block, and the sliding claw stretches out and contracts on the sliding block in a sliding mode; the supporting module comprises a cushion cover and a cushion plate. According to the device and the method, the sliding claws extend out of