Air flow adjusting valve

The utility model discloses an air flow adjusting valve. The air flow adjusting valve comprises a bracket, and an adjusting valve body arranged on the bracket; a hollow cavity is formed in the adjusting valve body; an air inlet and an air outlet which are communicated with the hollow cavity are respectively formed in one end of the adjusting valve body in the axial direction and the radial direction; the other end of the adjusting valve body is provided with a stepping motor; a rotating valve element connected with the power output end of the stepping motor is arranged in the hollow cavity; a copper plug is arranged on the top end of the rotating valve element; a tapered end in match with the air inlet is arranged on the top end of the copper lug; a positioning block in match with the rotating valve element is arranged on the adjusting valve body. The air flow adjusting valve has the beneficial effects that angle clockwise and anticlockwise rotating angle of the stepping motor can be controlled to enable the rotating valve element to drive the copper plug to move up and down so as to control the size of the air inlet; the air flow adjusting valve is simple in structure, reliable in connection and high in air flow adjusting precision, and has a good market prospect.