The invention discloses a multi-functional valve disc and an air valve system, and is used in the technical field of compressors. The multi-functional valve disc comprises a valve disc body, and a flexible air suction tongue piece is arranged in the position, corresponding to a valve plate air suction hole, of the valve disc body; a flexible throttle tongue piece is arranged in the position, corresponding to a valve plate throttle hole, of the valve disc body; and the opening height of the throttle tongue piece can be increased or decreased according to the pressure gradient of the valve plate throttle hole. The air valve system further comprises the valve plate, a cylinder seat and the multi-functional valve disc, wherein the multi-functional valve disc is mounted between the valve plate and the cylinder seat; the valve plate air suction hole, a valve plate exhaust hole and the valve plate throttle hole are formed in the valve plate; the multi-functional valve disc fits the front surface of the valve plate; the air suction tongue piece right faces the valve plate air suction hole; the throttle tongue piece right faces the valve plate throttle hole; and an exhaust valve disc right facing the valve plate exhaust hole is arranged on the back surface of the valve plate. According to the multi-functional valve disc, the structure is simple, flow resistance at the throttle hole is reduced on the basis that parts do not require to be newly added, cost is low and an assembly technology is not newly added, and the starting performance o the compressors is improved.