An SF6 aerating device capable of reducing the aeration leakage rate comprises an SF6 bottle, a gas pipeline, and a connector; and is characterized in that a U-shape pipe is arranged in the gas pipeline, the section between the input end of the U-shape pipe and the SF6 bottle is the first horizontal pipe section; the output end of the U-shape pipe is connected to the input end of a second horizontal pipe section, the first horizontal pipe section and the second horizontal pipe section are in the same plane; the output end of the second horizontal is connected to the input end of a vertical pipe section, the output end of the vertical pipe section is connected to a third horizontal pipe section; the height of the third horizontal pipe section is lower than that of the lowest point of the U-shape pipe, the connector is connected to the output end of the third horizontal pipe section; the connector comprises a shell and a gas channel arranged in the shell, a movable blocking ball is arranged in the gas channel, the diameter of the input end of the gas channel is less than that of the output end of the gas channel, the diameter of the movable blocking ball is larger than that of the input end of the gas channel, and a spring which can stretch out and draw back along the gas delivering direction is arranged between the movable blocking ball and the output end of the gas channel. The device can reduce the leakage during aeration process.