Abstract: This invention belongs to a technical field of a hand dryer and, more particularly, relates to an air inlet and outlet device of a hand dryer. The air inlet and outlet device including a base, a fan fixedly connected with the base, an electric heater connected with the fan, an air inlet, and an air outlet. The top of the air outlet is in a parabolic shape to improve the efficiency of flowing out of air. A baffle is disposed inside the air inlet to divide the air inlet into two chambers, and one or more baffles are disposed at the air outlet to prevent the leakage of motor sound from the air inlet and the air outlet. The invention has a compact structure, a low noise, and a high efficiency of flowing out of the air and is applicable to different hand dryers.