The invention provides a coil opening device, and relates to the technical field of coil opening equipment. The coil opening device comprises a base, a sliding seat, a lifting mechanism, an inner blocking seat, a bottom plate, springs, outer blocking seats and moving mechanisms; and the lifting mechanism is arranged on the base, the sliding seat pushes the bottom plate to move up and down in the axial direction of the inner blocking seat and the outer blocking seats through the lifting mechanism, the outer blocking seats move on connecting rods on the sliding seat, the side edges of the outerblocking seats and the side edge of the sliding seat are used as spring seats of the springs, the inner blocking seat is fixedly arranged on the base, and the moving mechanisms are arranged under thebase. According to the coil opening device, coiling and coil opening of a coiled aluminum rod and a coiled copper pipe are realized, the coil opening outer diameter of the raw material can be adjusted, the anti-dropping effect is good, time and labor are saved, safety and reliability are achieved, observation is convenient, structure is simple and practical, use is convenient, the unwinding effectis good, and production efficiency is greatly improved.