The invention relates to a multi-loop-circuit safety testing system and a multipath switching device. The testing system comprises a safety tester and the multipath switching device. A testing end of the safety tester is connected with an input end of the multipath switching device, and an output end of the multipath switching device is connected with a plurality of loop circuits of a device being tested; via programmed control over control switches and a changeover switch of a multipath testing device, any two loop circuits of the device being tested can be tested according to test requirements or a circuit part between any single loop circuit and the ground can be tested simultaneously or in different time, users can be saved from trouble of incessantly switching testing wire cables and conducting multiple times of tester operation during conventional testing operation, and efficiency of testing the device being tested can be greatly improved.