The invention relates to an automatic welding production line, in particular to a carriage plate robot welding automatic production line. The carriage plate robot welding automatic production line comprises a feeding spot welding position, a front side welding position, a workpiece overturning position, a back side welding position and a taking position which are connected in sequence. When the automatic welding production line is adopted, spot welding is conducted manually at the feeding spot welding position; a front side welding robot completes welding of all weld joints in the front side at the front side welding position; the workpiece overturning position can turn over workpieces automatically at the workpiece overturning position; a back side welding robot completes welding of all weld joints in the back side at the back side welding position; the workpieces are conveyed to the taking position after back side welding is completed, and then the workpieces can be grabbed away by a grabbing mechanism. The working efficiency can be effectively improved, and manual labor intensity is reduced.