Workpiece leak detection device

The invention discloses a workpiece leak detection device comprising a gas collection box, a first inflation device, an exhaustion device, a vacuum device, a second inflation device, a leak detector and a helium recovery device. The gas collection box is closable and used for accommodating the workpiece to be tested and collecting leak gas of the workpiece to be tested. A quick connector is arranged in the gas collection box and communicated with the first inflation device, the exhaustion device, the vacuum device, the second inflation device and the helium recovery device which are outside the gas collection box through pipelines, respectively. The leak detector is arranged outside the gas collection box. A suction gun of the leak detector can extend into the gas collection box. The workpiece leak detection device is simple in structure, low in production and maintenance cost, high in automation degree, strong in anti-interference capability and high in leak detection precision.