Transmission device of water-driven no-power exhaust fan

The invention discloses a transmission device of a water-driven no-power exhaust fan. The transmission device comprises a housing, wherein an air exhaust assembly and an impeller air exhaust assembly are arranged in the housing; the impeller air exhaust assembly comprises a mounting inner barrel; one side of the mounting inner barrel is horizontally provided with a transmission inner barrel; a transmission shaft is arranged in the transmission inner barrel; and a rotary shaft is arranged in the mounting inner barrel, and is rotatably connected to the transmission shaft. Circulating fire-fighting water in a ship body is circulated to drive an impeller to rotate; the fire-fighting water is firstly supercharged by a water inlet supercharging assembly, and secondly, hollow 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 servic