The invention discloses an efficient numerical control automatic plane chamfering machine, and relates to the technical field of numerical control processing equipment. The efficient numerical controlautomatic plane chamfering machine comprises a machine frame, wherein a first slide rail and a first driving assembly are arranged on the machine frame; a slide moving seat connected with the first driving assembly is glidingly arranged on the first slide rail; a fixing seat is arranged on the slide moving seat; a first clamp tool mechanism is arranged on the fixing seat; a second driving assembly and a second slide rail are arranged on the machine frame; a cutter mechanism is arranged on the second slide rail in a slide moving way; the cutter mechanism comprises a moving seat, a first cutter, a second cutter and a third driving assembly; the moving seat is glidingly arranged on the second slide rail; the first cutter and the second cutter are rotationally arranged on the moving seat; thethird driving assembly is arranged on the moving seat and is connected with the first cutter and the second cutter. Through the arrangement of the first cutter and the second cutter on the machine frame, the plane-shape processing and the arc-surface-shape processing on a valve seat can be realized; the work procedure of replacing the equipment is omitted; the time during the replacement is reduced, so that the production efficiency of the valve seat is improved.