The invention discloses a schering bridge based insulating gas liquefaction temperature testing device and method. The schering bridge based insulating gas liquefaction temperature testing device comprises a thermostat, a constant volume bottle, an electrode couple, a gas distributing device, a liquid phase detection device and a data monitoring and processing unit; the constant volume bottle is arranged in the thermostat, a thermometer and a pressure gauge are arranged in the constant volume bottle; the electrode couple is arranged on the wall of the constant volume bottle, a discharge end ofthe electrode couple is located in the constant volume bottle, the two ends of the electrode couple located outside the constant volume bottle are connected with a high voltage power supply to form aloop; the liquid phase detection device comprises a schering bridge; a detection end of the schering bridge is arranged in the constant volume bottle; the gas distributing device is communicated withthe constant volume bottle; and the thermometer, the pressure gauge, the thermostat, the gas distributing device and the liquid phase detection device are respectively communicated with the data monitoring and processing unit through a signal line. The testing device solves the problem of proximity existing in the calculated value of the ideal gas equation, and the liquefaction temperature of theinsulating gas is tested on site and verified.