Walking welding production line

The invention discloses a walking welding production line. Welding robots do linear motion on a track, a plurality of workpiece clamps are arranged on the two sides of the track, workpieces to be welded are fixed to the workpiece clamps, the welding robots conduct mixed welding on the workpieces to be welded, and two welding tongs are fixed to two welding robot bases in a distributed mode and walk along with the line. Two welding tongs to be replaced are placed on each welding tongs position and used for automatically replacing the welding tongs by the welding robots according to a preset operation program, and two grinding devices are respectively fixed on the two welding robot bases and walk along with the line. Each of the opposite sides of the base of each welding robot is provided with a laser ranging unit, the center of each base is provided with a control device, GPS positioners are used for determining the positions of the robots, the robot origin position of each clamp is recognized through a GPS in