The invention discloses a clamp alternate moving device for glass mold machining, and belongs to the technical field of auxiliary facilities for glass mold machining. The device comprises a clamp platform supporting mechanism corresponding to glass mold machining equipment, left and right glass mold loading and unloading region guide rail mechanisms arranged at the portions, corresponding to the left and right sides of the clamp platform supporting mechanism, of the terrace, a mobile car lifting mechanism arranged at the bottom of the clamp platform supporting mechanism, left and right mobilecars forming a rolling pair with the left and right glass mold loading and unloading region guide rail mechanisms, and a rack fixing base, wherein a rack is arranged at the upper portion of the rack fixing base, the middle of the rack fixing base and the middle of the rack form a lifting rack fixing base and a lifting rack, and the left and right mobile cars are lifted upwards or displaced downwards by the mobile car lifting mechanism; a left clamp platform is installed on the top of the left mobile car, a left clamp mechanism is arranged at one side of the left clamp platform, a right clamp platform is installed at the top of the right mobile car, and a right clamp mechanism is arranged at one side of the right clamp platform. The working efficiency of the glass mold machining equipment is improved, energy consumption is saved, and labor force is saved.