The invention discloses a dual-box linkage vacuum helium leak detecting system which comprises a gas station and further comprises a helium mass spectrometer leak detector, an emptying pump, a helium recovery device and two vacuum boxes.The two vacuum boxes are each internally provided with a workpiece to be detected.Each workpiece to be detected is connected with the gas station through a gas inlet pipeline, connected with the emptying pump through a workpiece gas extraction pipeline and connected with the helium recovery device through an inflation pipeline.A communicating pipeline is arranged between each workpiece to be detected and the corresponding vacuum box.Each vacuum box is connected with the emptying pump through a box body gas extraction pipeline, connected with the helium mass spectrometer leak detector through a detection pipeline and provided with an atmosphere pipeline communicated with the atmosphere.Each pipeline is provided with a valve.The two vacuum boxes and the workpieces to be detected are alternately detected, the detecting system is sufficiently utilized, the efficiency is greatly improved, and working time is effectively shortened.