The utility model provides an air separation device's energy -conserving air feeder of compressor, it is main includes the product compressor, buffer tank, check valve, two sets of pressure regulating valvess and corresponding pressure controller, the product compressor connect through a check valve the buffer tank, the check valve around respectively connect pressure regulating valves of the same kind to net with the trachea to the user, the both ends of check valve dispose a bypass regulating valve. The utility model belongs to to prior art's an improvement, it has, and the flow is simple, safe and reliable, saving energy and increasing the efficiency, can effectively reduce characteristics such as product compressor pressure.