The invention relates to a multifunctional combination valve structure for an air compressor. The multifunctional combination valve structure for the air compressor comprises a flange cover, an oil separation base and an oil filtration base, wherein the oil separation base and the oil filtration base are arranged on the flange cover; a mounting block for mounting a main machine is also arranged on the flange cover; a gas opening for communicating the main machine with an oil separation barrel is formed in the mounting block; a bent pipe is arranged in the gas opening; the bent pipe is used for enabling an oil-gas mixture discharged by the main machine to enter the oil separation barrel in a tangential direction and spirally slide down along the side wall of the oil separation barrel, so that the oil-gas separation is achieved. Compared with the prior art, the multifunctional combination valve structure for the air compressor has the advantages of energy conservation, emission reduction, high energy efficiency and few leakage points.