Booster turbine expansion equipment

The utility model relates to the technical field of booster turbine expansion equipment, and discloses booster turbine expansion equipment which comprises an expansion machine body, a booster body is arranged on one side of the expansion machine body, a bearing sealing cavity is arranged between the expansion machine body and the booster body in a communicated mode, and a water tank is arranged outside the bearing sealing cavity in a sleeved mode. The water tank is fixedly connected with the expansion machine body and the supercharger body; through the water tank and the water inlet pipe, cooling water can be input into the bearing sealing cavity to cool the bearing with overhigh internal temperature, and the situation that the bearing is possibly damaged due to the fact that the lubricating performance is reduced and the surface abrasion of the bearing is aggravated due to evaporation and oxidation of lubricating oil of the bearing is prevented; the gear can drive the fan to annularly rotate around the water