Leakage rate detection device and method

The invention discloses a leakage rate detection device and method.The leakage rate detection device comprises a gas path channel, an execution assembly and a detection assembly, the gas path channel comprises a gas inflation pipeline and a constant-pressure pipeline, the gas inflation pipeline is used for conveying gas to a detected container, and the constant-pressure pipeline is used for supplementing gas into the detected container; the execution assembly comprises a pressure transmitter, an electromagnetic valve unit, a flow control valve and a controller, the flow control valve is arranged on the constant-pressure pipeline and used for adjusting the gas flow in the constant-pressure pipeline, the pressure transmitter is used for measuring the gas pressure in the measured container, and the controller is used for adjusting the opening degree of the flow control valve according to the received real-time pressure value. And the detection assembly comprises a flow meter unit arranged on the constant-pressur