The invention discloses a current isolation mutual inductor. The current isolation mutual inductor comprises a mutual inductor shell used for avoiding external signal interference, a permalloy iron core I, a permalloy iron core II, and a winding W1, a winding W2, a winding W3, a winding W4 and a winding W5 of the permalloy iron core I and the permalloy iron core II. The current isolation mutual inductor further comprises an electronic compensating circuit used for compensating for the magnetic potential. The permalloy iron cores, the windings of the permalloy iron cores and the electronic compensating circuit are arranged in the mutual inductor shell. The electronic compensating circuit comprises a power module, an operational amplifier circuit, an open circuit detection circuit and an alarm circuit. The current isolation mutual inductor has the advantages that detection of a three-phase direct access type electricity meter can be completed when a three-phase assembly line and a three-phase equipotential calibration device are not unhooked or can not be unhooked in the calibration process, the current isolation mutual inductor is simple in overall structure and elegant and attractive in appearance, line outgoing and line incoming are standard, the current input and output wiring mode is simple and reliable, and the current isolation mutual inductor is convenient to use.