The invention provides a cable elbow-type joint quadrangle hoop dismounting device, and belongs to the technical field of power transmission and distribution engineering. The cable elbow-type joint quadrangle hoop dismounting device is composed of a quadrangle hoop which is formed by four segments via hinging, a set of bolt and two nipping nails. The quadrangle hoop closely embraces an elbow-type joint clinging equipment segment; and the two nipping nails, of which one is arranged on the upper part and the other is arranged on the lower part, abut against equipment to jack up the quadrangle hoop which embraces an elbow-type joint so that the elbow-type joint is pulled out of the equipment. The cable elbow-type joint quadrangle hoop dismounting device is simple and convenient without damage to the elbow-type joint, and thus the cable elbow-type joint quadrangle hoop dismounting device is used for the power transmission and distribution engineering.