Gas tightness detection device of balanced valve

The utility model relates to a gas tightness detection device of a balanced valve, which comprises a detection mechanism, a pneumatic system, a hydraulic system, a water pump and a PLC control system, wherein the PLC control system is connected with the pneumatic system, the hydraulic system and the water pump, when a balanced valve to be measured is put into the detection mechanism, the PLC control system controls the pneumatic system, the hydraulic system and the water pump switch to move according to a built-in program, thereby executing program detection. The gas tightness detection device leads the detection process to automatically run, greatly reduces detection time, lightens labor intensity, has high detection data accuracy, and is not influenced by human factors.