Supercharging assembly of water-driven no-power exhaust fan

The invention discloses a supercharging assembly of a water-driven no-power exhaust fan. The supercharging assembly comprises a housing; one end of the housing is provided with a water inlet supercharging assembly; the water inlet supercharging assembly comprises a supercharging shell; one end of the supercharging shell is provided with a water inlet; cavities are arranged in the supercharging shell; and supercharging blades are arranged at the periphery of the cavities. Circulating fire-fighting water in a ship body is circulated to drive an impeller to rotate; the fire-fighting water is firstly supercharged by the water inlet supercharging assembly, and secondly, the cavities adopt shape designs of different sizes, so that the water pressure size is further increased; and reverse-direction impact is carried out on a curved-surface impeller set, so that the rotation centrifugal force is increased, the service life of the curved-surface impeller set is prolonged, and an air exhaust distance in the ship body c