The invention relates to a method and a system for robot carving machining for three-dimensional specially-shaped stone. A six-axis serial robot is utilized for cooperating with a rotatable workbench,carving machining for the three-dimensional specially-shaped stone is realized in combination with corresponding CAD, CAM and CNC software, and machining for a large carving can be realized, so thatthe machinable model range is greatly expanded; and many machining manners of saw cutting, rough machining, semi-finish machining and finish machining are combined in a machining process, and different tools and process parameters are selected in different machining processes, so that the machining efficiency is increased while the final machining quality is ensured, promotion and application fora fully-automatic stone carving technology are benefited, and the method and the system are of great significance to the development of the whole stone carving industry.