The invention discloses an exhaust fan with fan blades convenient to clean. The exhaust fan comprises an exhaust fan box, wherein a protective net is installed at the position, close to the middle, of the back face of the exhaust fan box, an exhaust fan is installed at the position, close to the middle, of the interior of the exhaust fan box, and a motor connected with the exhaust fan box is installed at the position, close to the middle, of the back face of the exhaust fan; eight adjusting blades penetrating through the inner side of the exhaust fan box are installed on the front face of the exhaust fan box, a side groove penetrating through the side face, the top face, the bottom face and the front face of the exhaust fan box is formed in the position, close to the front end, of one side of the exhaust fan box, a blade clamping mechanism is installed in the side groove, and a sliding groove is formed in the position, close to the other side, of the interior of the exhaust fan box; and a fastening plate is mounted on one side of the sliding groove. The exhaust fan has the good capability of promoting air flow, can conveniently clean the fan blades of the exhaust fan, can conveniently clean dust on the adjusting blades, can adjust the wind direction of the exhaust fan, and can adapt to different environments.