The invention relates to a liquid storage barrel which is mainly used to store liquids. The liquid storage barrel comprises a barrel body and a ball valve, and further comprises an elastic rubber liner for storing the liquid. A protective layer is connected to the inner cavity wall of the barrel body which is provided with an opening connected with a barrel cover. The elastic rubber liner is located in a cavity of the barrel body and connected with the barrel cover detachably. The ball valve is installed on the barrel cover and is communicated with the cavity of the elastic rubber liner. According to the liquid storage barrel provided by the invention, the liquid stored can be automatically discharged without air pressure, so that the air leakage problem after long time storage is avoided. In the using process, if parts are aged, the parts can be changed independently.