The invention relates to a liquid storage tank, in particular to a special liquid medicine storage tank. According to the technical scheme, the special liquid medicine storage tank comprises a tank body, a liquid medicine inlet and a liquid medicine filling outlet are formed in the bottom of the tank body, the top of an upper cover is provided with a cleaning water inlet and an exhaust port, and a rotary spraying ball is arranged at the position of the cleaning water inlet. The special liquid medicine storage tank further comprises a supporting device, the supporting device comprises four supporting legs, a connecting base is arranged at the upper ends of the supporting legs, and four supporting arms corresponding to the supporting legs one to one are arranged on the tank body; the supporting arms are fixed to the connecting base, and a tail gas absorption system is arranged on one side of the tank body and comprises an absorption tank, a bridge tank and a sewage treatment pond. The special liquid medicine storage tank has the advantages of being reasonable in structure, good in use effect and high in functionality.