The invention discloses a tool for a temporary guy wire. The tool comprises a male pivotal part, a female pivotal part and dowels, wherein each pivotal part comprises two wall surfaces with semi-circular cross sections; round pipes are fixed on two sides of an open end of each wall surface, the round pipes on the same side are partially located on the male pivotal part and partially located on the female pivotal part in a staggered manner, every two wall surfaces are fixed together by the round pipes between the two wall surfaces, the round pipes located on one side of the outer sides of the two wall surfaces are used for pivoting the male pivotal part and the female pivotal part, and the fixing dowels are arranged on the round pipes; a hanging ring is arranged at an end of one pivotal part. The tool for the temporary guy wire has the advantages that the construction time is shortened greatly, labor demand is reduced, the working efficiency is increased, stress uniformity of the temporary guy wire is improved, stress of an original guy wire is not affected, the service life of the guy wire is prolonged greatly, and personal injury caused by outburst of a steel wire of the guy wire is reduced.