The utility model discloses a pin dismounting device, its characterized in that is equipped with fixing base and bracing piece, fixing base and bracing piece one end are equipped with the connecting rod correspondingly, the preceding tip of a connecting rod is equipped with the forward screw, the preceding tip of another connecting rod is equipped with reverse screw, two connecting rods are connected through the binding, the binding is equipped with bow -shaped support, the both ends of bow -shaped support are equipped with the nut respectively, be equipped with position sleeve and fixation nut on the bracing piece, fixed cover one side is equipped with locating screw holes, be equipped with to the interval positioning groove on the locating lever, the locating lever passes fixed cover lower extreme and is equipped with the positioning disk, the locating lever is through positioning bolt and locating screw holes location, it is connected with the nut through the screw thread to dismantle the screw rod, it is equipped with a needle holder utensil to dismantle the screw rod lower extreme, it dismantles the hole to be equipped with on the fixing base of thimble below, be equipped with the thimble in the anchor clamps, it is equipped with the swing handle to dismantle the screw rod upper end, and is advantaged by simple operation, high durability and convenient use, is portable and easy to carry, advantages such as work efficiency height.