Workpiece leak detecting device

The utility model discloses a workpiece leak detecting device comprising a gas collection tank, a first air charging device, an air exhausting device, a vacuum-pumping device, a second air charging device, a leak detector and a helium recovery device. The gas collection tank is lockable, and is used for accommodating a workpiece to be detected and collecting leak indication gas leaked by the workpiece to be detected; a quick coupling is arranged in the gas collection tank, the quick coupling is communicated with the first air charging device, the air exhausting device, the vacuum-pumping device, the second air charging device and the helium recovery device through pipelines, and the first air charging device, the air exhausting device, the vacuum-pumping device, the second air charging device and the helium recovery device are all arranged outside the gas collection tank, the leak detector is arranged outside the gas collection tank, and a suction gun of the leak detector can extend to the exterior of the gas