The invention discloses a fully automatic stone face milling machine. The machine comprises two symmetric pedestals, wherein the pedestals are provided with guide rails; a movable cross beam and a cross beam driving mechanism are arranged on the guide rails; the cross beam is provided with a knife rest which can travel along the cross beam; and a working table is arranged between the two pedestals. A machining process of the stone face milling machine is fully and automatically controlled by inputting numerical values in a man-machine conversation mode, and the machine has unidirectional machining and multidirectional composite machining functions; the equipment is easy and convenient for operation, and different machining parameters can be set according to different product types to improve machining efficiency; energy and power are saved by adopting a variable frequency control technology; the execution is fully and automatically controlled through digital set point control and digital quantitative control, the machined product has a completely flat surface and uniform thickness, and the problem of edge breakage of the product can be solved well; and water is added to a grinding disc to a fixed thickness, so that dust is effectively eliminated and environment is protected.