The invention discloses a hoisting chain machining device which comprises a work table, an upper die body, a lower die body, side idler wheels, a sliding rail, a sliding block, supporting plates and a limiting plate. The sliding rail is fixedly connected to the work table. The sliding block is connected to the sliding rail in a sliding mode. The lower die body is fixedly connected to the sliding block. The upper die body is movably inserted into the lower die body. The two side idler wheels are symmetrically connected to the two sides of the sliding rail in a rotating mode. The two supporting plates are arranged on the front sides of the two side idler wheels respectively. The limiting plate is arranged at one side of one supporting plate. The hoisting chain machining device is simple in structure and convenient to operate, increases the raw material utilization rate, and reduces the manufacturing cost.