The invention relates to a reversible axial-flow waterpower blower fan. The reversible axial-flow waterpower blower fan is mainly formed by a ventilation outer cylindrical shell, a water pump water turbine, a Y type bracing frame type bearing body, a reversible blower fan impeller, a public rotating shaft and the like. The reversible axial-flow waterpower blower fan can utilize the waterpower to drive exhausting and blowing in the forward direction, and can also utilize wind power to drive water drawing in the reverse direction. The reversible axial-flow waterpower blower fan has the advantages of being reasonable in arrangement of the whole machine, being simple in structure, being small in body type, being light in weight, being portable, being easy for dismounting and mounting, being convenient for maintenance, being high in operability, being stable and reliable in operation, being small in vibration, and being low in noise, and is suitable for the occasions, an oil tanker, a chemical article ship, a ship, an underground building, a subway tunnel, an industrial and mining enterprise and daily fire-fighting and disaster rescue.