Leakage test system

The utility model discloses a leakage test system, comprising a gas source, a low pressure proportioning valve, a high pressure proportioning valve, a first flowmeter, a second flowmeter, a pneumatic plugging connector, a programmable program controller (PLC) and a human-computer interface. A gas passage portion of the gas source is in connection with a booster pump and a solenoid valve; the other end of the solenoid valve is divided into two branches, wherein one branch is successively in connection with the low pressure proportioning valve, the first flowmeter and the pneumatic plugging connector through pipelines and the other branch is successively in connection with the high pressure proportioning valve, the second flowmeter and the pneumatic plugging connector through pipelines; the pneumatic plugging connector is provided with a pressure sensor used for detecting entrance gas pressure at an entrance of a detected workpiece and converting the pressure into signals; the low pressure proportioning valve, the high pressure proportioning valve, the first flowmeter, the second flowmeter, the pressure sensor and the human-computer interface are respectively in connection with the PLC. The leakage test system can detect minimal leakage of a workpiece in a short time, eliminate human factor influence in detection and minimize system error.