The utility model discloses a pin pulling device having the advantages of high working efficiency and safety and reliability in operation. The pin pulling device comprises a bottom plate, and a bracket fixedly connected with the bottom plate into a whole, wherein a through hole is formed above the bracket; a connecting screw is arranged in the through hole; both sides of the bracket are provided with hydraulic props. In the pin pulling device, the bottom plate is integrated with the bracket, the connecting screw is arranged in the through hole above the bracket, and both sides of the bracket are provided with the hydraulic props. During use, a detached machine part is placed above the bracket, the connecting screw is screwed integrally with a connecting pin, the upper end of the hydraulic bracket is pressed against the machine part, and the connecting screw on the machine part is pulled out of the machine part under the action of the hydraulic props. Since the hydraulic props are adopted for supplying power, force is applied stably, impact on the connecting pin is reduced, the pin pulling efficiency is high, safety and convenience are realized, and the machine part is prevented from being damaged easily.