Water driven fan

The utility model discloses a water driven fan, which essentially comprises a machine frame, water wheels, a drive shaft and an air blower. The water wheels are installed on the machine frame through the drive shaft, and the air blower is provided with an air blowing mechanism composed of a blower shaft, a single blower blade and a rocker. The blower shaft is horizontally fixed on a casing of the air blower, the blower blade is arranged inside the air blower and fixed on the blower shaft, and the rocker is arranged outside the casing of the air blower and fixedly connected with one end of the blower shaft. The drive shaft sequentially passes a gear shift mechanism and a crankshaft connecting rod mechanism to be connected with the rocker arranged on the air blower. The air blower comprises an air inlet and an air outlet, and non-return elastic pieces are respectively arranged inside the air inlet and outside the air outlet. The water driven fan is driven by common stream water which serves as the power source