The invention relates to an insulation leakage current testing device. The device communicates and connects with an upper computer of a monitoring system; the device comprises a power panel, a mastercontrol panel, a quick-measuring panel, a 16-circuit board, and a 32-circuit board; the master control panel communicates and connects with the quick-measuring panel and the 16-circuit board; the 16-circuit board communicates and connects with the 32-circuit board; the power panel is connected with the master control panel, the quick-measuring panel, the 16-circuit board and the 32-circuit board;the master control panel is connected with the upper computer of the monitoring system through a network communication way. Compared with the prior art, the testing device has the advantages of beingdiversified in testing function and good in expandability.