Acetylene gas holder

The utility model discloses an acetylene gas holder. The acetylene gas holder comprises a water tank, a guide rail arranged outside the water tank, and a bell jar arranged on the guide rail; the bell jar covers the water tank, a gas inlet pipe is arranged on the bell jar and extends into the water tank, a blowoff pipe is arranged on the bell jar, a hose is arranged on the blowoff pipe, and an elastic gas bag is arranged on the hose. Furthermore, a blowoff valve is arranged on the blowoff pipe. Besides, an exhaust pipe is arranged on the elastic gas bag and an exhaust valve is arranged on the exhaust pipe. Compared with the prior art, the acetylene gas holder is simple in structure; the acetylene discharged by the blowoff pipe can be collected in the elastic gas bag and resource waste is avoided.