A vacuum electrically controlled proportional valve includes a valve seat coupled to a guide seat. The guide seat is connected, at a top thereof, to a vacuum pressure electromagnetic valve, an atmospheric pressure electromagnetic valve, and a sensor. A main diaphragm is sandwich between the seat valve and the guide seat to define a vacuum pressure chamber. A pilot discharge straight rod that is provided with a vacuum valve gate assembly is fit to a center of the main diaphragm. A master channel through which a primary-side pressure and a secondary-side pressure flow is provided. A regulation channel is provided and controlled by the vacuum pressure electromagnetic valve and the atmospheric pressure electromagnetic valve. A pilot atmosphere channel is connected to a space under the main diaphragm. A first and a second vacuum destruction valve gates are provided for adjusting, in stage-wise manner, the level of vacuum pressure.