Exhaust fan capable of adjusting flow

The utility model discloses an exhaust fan capable of adjusting flow, and relates to the field of exhaust fans, the exhaust fan comprises a cylindrical shell, a fan body, a barrel-shaped adjusting cover body and a driving piece, one end of the cylindrical shell is used for being connected with the fan body; the barrel-shaped adjusting cover body covers the other end of the barrel-shaped shell and can move relative to the barrel-shaped shell, and at least one air hole is formed in the side wall of the barrel-shaped adjusting cover body; the output end of the driving part is connected with the barrel-shaped adjusting cover body and used for driving the barrel-shaped adjusting cover body to move relative to the barrel-shaped shell so as to adjust the size of the portion, exposed out of the barrel-shaped shell, of the air hole. The barrel-shaped adjusting cover body is driven by the driving part to move relative to the barrel-shaped shell, so that the size of the part, exposed out of the barrel-shaped shell, of t