The invention relates to a remote multifunctional mutual inductor secondary circuit polarity tester. The remote multifunctional mutual inductor secondary circuit polarity tester is characterized in that a rechargeable lithium battery is connected with an inching relay in series, four wiring terminals A, B, C and N are arranged outside a primary side shell, three relay contact switches communicatewith the four wiring terminals, and the four wiring terminals are respectively connected to the primary side loops of the mutual inductor; the four wiring terminals A, B, C and N are arranged outsidea secondary side shell, the four wiring terminals are respectively connected to the secondary side loops of the mutual inductor; a loop change-over switch and a function change-over switch are connected in series, and a polarity pointer meter and an insulation test meter/direct-current resistance tester are connected in parallel and jointly connected to the function change-over switch. The remotemultifunctional mutual inductor secondary circuit polarity tester is scientific and reasonable, is flexible and convenient to operate, can achieve the free conversion of six groups of loops and the testing of auxiliary DC resistance and loop insulation, reduces the manpower investment and operation risks, and improves the work efficiency.