The utility model relates to an electric appliance, and particularly relates to a vertical fan with an adjustable rotation angle. A stand column is composed of an upper stand column and a lower stand column which are rotatably connected through a rotating device, the rotating device comprises a motor, an annular support plate, a coupling, a bracket, a ball sleeve, a ball, a left travel switch and a right travel switch, wherein the ball can roll along an annular rolling slot, and the left and right travel switches can slide along the annular guide slot; the motor is arranged on the lower stand column; the annular support plate is arranged at the top of the lower stand column, and the upper surface of the annular support plate is provided with the annular rolling slot and the annular guide slot; a rotating shaft of the motor is fixedly connected with the bottom end of the upper stand column through the coupling, and the side face of the coupling is provided with a firing pin; the bracket is arranged on the side face of the upper stand column; the ball sleeve is fixedly connected with the bracket; the ball is arranged in the ball sleeve; the bottom end of the left travel switch is arranged in the annular guide slot; and the bottom end of the right travel switch is fixedly connected with the annular support plate. The vertical fan disclosed by the utility model is simple in structure and convenient to use; and the rotation angle of the fan can be adjusted arbitrarily so as to meet the needs of people, thereby producing a certain beneficial effect.