Additive manufacturing metal surface polishing and grinding method

The invention discloses an additive manufacturing metal surface polishing and grinding method. The method includes the following steps that S1, an electrolyte solution is prepared, specifically, all the following components including, by mass, 40%-50% of carbonate, 20%-40% of carbonaceous organic material, 10%-15% of halide and 10%-15% of water are mixed, and a mixed electrolyte solution is obtained; and S2, additive manufacturing metal micro-arc discharge is performed, specifically, an additive manufacturing metal workpiece is put in the prepared electrolyte solution at the room temperature, additive manufacturing metal serves as an anode, graphite serves as a cathode, the additive manufacturing metal workpiece is put in the solution to be treated for 3-5 minutes under working voltage, and metal surface polishing and grinding are achieved. The additive manufacturing metal surface polishing and grinding method is high in treatment speed and short in treatment time, the surface bio-compatibility is high, residual materials can be fast removed, and moreover, the surface properties are not affected.