The invention belongs to the technical field of gear machining and particularly relates to a numerical control rotary-separating gear edge milling machine. The numerical control rotary-separating gearedge milling machine comprises a lathe bed, and two transverse slide rails arrayed in parallel are arranged on the rear portion of the upper surface of the lathe bed. A main shaft box is fixedly connected to the side of the front portion of the upper surface of the lathe bed, and a centre device is slidably connected to the other side of the front portion of the upper surface of the lathe bed. Aleft tool shaft system and a right tool shaft system are arranged on the transverse slide rails in a spaced mode. The actions of the main shaft box, the centre device, the left tool shaft system and the right tool shaft system are all controlled by a numerical control system. The numerical control rotary-separating gear edge milling machine has the advantages that the numerical control system controls chamfering tools on four tool shafts in the left tool shaft system and the right tool shaft system to enable the two faces of a workpiece to be sequentially subjected to edge milling machining, the machining frequency and work procedures are reduced, the errors generated due to multi-time clamping are avoided, and thus the machining accuracy is better.