The invention relates to a high-strength parallel steel strand stay cable paying-off frame and an operation method thereof. The high-strength parallel steel strand stay cable paying-off frame comprises a base, a stand column and a supporting part, wherein the stand column and the supporting part are arranged on the base. The base comprises a base plate, supporting legs arranged on the base plate and connecting holes formed in the base plate. The paying-off frame further comprises an upper bearing and a lower bearing which are symmetrically fixed at the two ends of the stand column, a mountingturntable arranged on the lower bearing, a radiation beam arranged on the mounting turntable, a vertical rod hinged to the radiation beam, a cross rod hinged to the vertical rod and the like. The bottom surface of the base plate is provided with a fixing chamber matched with the supporting legs in an array mode, one end of each supporting leg is inserted into the fixing chamber, and the supportinglegs are assembled and used for cable unfolding at an application site during use. According to the paying-off frame, the detachable design is adopted, transportation is convenient, assembly is simple, the cable unfolding difficulty of stay cables can be effectively reduced, and the working efficiency is improved.