Positioning shaft dismounting device

The utility model provides a positioning shaft dismounting device which comprises a support body for fixing the whole device, a screw rod, a nut and a handle, wherein an external thread section matched with the nut is arranged at one end of the screw rod, a via hole allowing the handle to pass is formed in the other end of the screw rod; and a via hole which can allow the screw rod to pass but prevents the nut from passing is formed in the support body. With the adoption of the positioning shaft dismounting device, a positioning shaft can be rapidly and conveniently dismounted when clamped, the structure is simple, and the operation is easy.