It is applicable to the processing of litchi surface on the surface of all kinds of granite and marble. The new design has applied for a number of patents. It adopts double grinding heads and conveyor belt type full-automatic continuous processing technology, with reasonable structure, perfect processing technology, stable performance, simple operation, high efficiency and energy saving. PLC control and intelligent operation are adopted. Computer scanning device is set at the plate inlet end to realize automatic lifting and avoidance of grinding head. It has the function of automatic and manual switching, and can control the lifting and lowering of grinding head at will. Maximum processing width: 1000mm