Novel surge tank

The utility model provides a novel surge tank, and belongs to the technical field of machinery. The surge tank solves the problems that an existing surge tank is high in manufacturing cost and complex in manufacturing process. The novel surge tank comprises a tank body with a cavity in the middle, a leather bag dividing the cavity into a water storage cavity and an air cavity is arranged in the tank body, an isolation layer is arranged on the portion, located in the water storage cavity, of the tank body and is close to the inner side wall of the tank body, and an air nozzle is arranged on the tank body and communicated with the air cavity. The isolation layer is provided with a connecting joint communicated with the water storage cavity, the connecting joint and the isolation layer are of an integrated structure, the tank body is provided with a through hole, the through hole is matched with the connecting joint, the connecting joint penetrates through the through hole, the connecting joint is in threaded co