The invention discloses a stay wire manufacturing device. The stay wire manufacturing device comprises a die, a pedestal, a left column and a right column respectively fixed at the left and right sides of the pedestal, a front bracket and a rear bracket respectively fixed at the front and rear sides of the pedestal, and a jack fixed at the middle of the pedestal, the front end of a lock rod is hinged to the upper part of the front bracket, the rear part of the lock rod is clamped in a slot in the upper end of the rear bracket, a groove wheel is fixed on the lock rod, and the groove wheel is located above the part between a left concave wheel and a right concave wheel. The stay wire manufacturing device is precise in location, both time and labor are saved, the manufacturing is standard and fast, the potential safety hazard on constructors and manufacturers due to the elasticity of a steel strand can be overcame, the working time is shortened, and the working safety is improved.