A combination suction regulator for medical use which comprises a cover, a vacuum gauge, a regulating module, an integrated flow channel module having a plurality of board surface flow channels, an intermittent timer module, a mode select switch, a vacuum relief and an air buffer. The air buffer is disposed inside the cover and integrally formed as a whole with the integrated flow channel module. A flow channel board and a bottom board coupled with each other to form the integrated flow channel module. The intermittent timer module comprises a diaphragm piston disposed on one side and the change valve disposed on another side of the middle part of the front side of the flow channel board.