The invention discloses a grinding robot which comprises a main machine body; a first sliding groove which is opened upwards is formed in the main machine body; a first sliding block capable of vertically sliding is arranged in the first sliding groove; a rotating cavity which is opened upwards is formed in the first sliding block; a grinding wheel disc is fixedly arranged in the rotating cavity;a bracket extending upwards is fixedly mounted at the left end of the upper end face of the main machine body; a top frame extending rightwards is fixedly mounted at the upper end of the bracket; a first transmission cavity and a second transmission cavity located on the right side of the first transmission cavity are formed in the top frame; a second sliding groove mutually communicating is formed between the first transmission cavity and the second transmission cavity; a third sliding groove extending leftwards and rightwards is formed in the top wall of the second sliding groove; a second sliding block capable of sliding leftwards and rightwards is arranged in the second sliding groove; and a third sliding block which can slide leftwards and rightwards and is fixedly connected with thesecond sliding block is arranged in the third sliding groove.