The invention relates to an air compressor air inflow control system and a control method thereof. The air compressor air inflow control system comprises an air inflow valve, a stopping air release valve, a circulation unloading valve, a pressure adjusting valve, a loading/unloading solenoid valve, a high/low pressure switching solenoid valve, a one-way valve, an adjustable throttling valve, a filter and a throttle valve. According to the air inlet control scheme, underloading staring of an air compressor can be achieved, low-pressure internal circulation of the air compressor system in the unloading state is maintained, two-gear system working pressure is achieved, starting difficulties of the air compressor can be overcome through the functions, energy-saving operation of the air compressor in the unloading state is guaranteed, and the high/low pressure working pressure of the system can be set according to operation requirements of clients.