The invention discloses a fire extinguishing gas tank with a function of overpressure treatment. The fire extinguishing gas tank comprises a tank body and a tank valve arranged on the tank body. A hydraulic cavity is formed in the tank body. The tank body is externally sleeved with a sleeve. At least two grooves are formed in the circumferential wall surface of the sleeve. The two grooves are symmetrical with respect to a center axis shaft of the tank body. Each groove is internally provided with a folding roller group. The interior of a hydraulic cavity is further provided with a pressure detector and a temperature sensor. The tank body is further provided with a microcontroller, an acousto-optic alertor and a driving mechanism. The driving mechanism is connected with the tank valve so that gas-out of the tank valve can be controlled. The pressure detector, the temperature sensor, the acousto-optic alertor and the driving mechanism are connected with the microcontroller. According tothe fire extinguishing gas tank with the function of overpressure treatment, the purposes that moving is convenient, the interior situation of the gas tank can be monitored, and if anomaly happens, alarming can be conducted timely, and automatic pressure releasing for preventing explosion is achieved are achieved.