The invention discloses a photoelectric combined detection method aiming at a mutual inductor of a distribution network. The photoelectric combined detection method is to use various methods of a mutual inductor comprehensive detector, an ultraviolet detector, an infrared temperature measurer, a partial discharge detector, X-ray perspective detection and the like in a combined manner to meet with the requirements of judging the properties and positions of defects of the mutual inductor exactly. The photoelectric combined detection method aiming at the mutual inductor of the distribution network not only can determine whether a fault or a defect exists inside a PT (Potential Transformer) and a CT (Current Transformer) directly and judge the property of the fault or the defect in time, but also can further position the fault or the defect exactly.