Automatic grinding system for conjoined hammer

An automatic grinding system for a connected hammer comprises grinding mechanisms, a discharging device and an electric control device, the grinding mechanisms are arranged on the two sides of the discharging device, each grinding mechanism comprises a feeding table assembly, a robot, a belt sander and an outer cover assembly, the feeding table assembly and the belt sander are arranged on the two sides of the robot respectively, a plurality of jigs are arranged on the feeding table assembly, and the outer cover assembly is arranged on the robot. The jigs are arranged on the feeding table assembly in a reciprocating motion mode in turn so as to feed the connected hammers, the robot is provided with a clamp assembly used for clamping the connected hammers so as to move the connected hammers to the belt sander or the discharging device, the belt sander is provided with a plurality of polishing assemblies used for polishing the connected hammers, and the polishing assemblies are used for polishing the connected h