The utility model relates to a mutual inductor lateral shell detection device. The device comprises an upper frame which is horizontally arranged, wherein a tripod is connected with the joint of a long frame and a short frame; a fixed rod is arranged in the upper frame, and a detection device is arranged at the bottom of the fixed rod; a lower frame symmetric to the upper frame is arranged under the detection device. The mutual inductor lateral shell detection device has the beneficial effects that the problem that the mutual inductor shell cannot be comprehensively detected can be solved by photographing a lateral shell of a mutual inductor by an industrial camera, the detection quality of a mutual inductor detection line can be improved, the situation that a groove in the outer wall of the lateral side of the mutual inductor cannot be detected can be avoided, and the situation that the shell in an intermediate hole of the mutual inductor cannot be detected can also be avoided. The mutual inductor lateral shell detection device is simple in whole structure, and easy to maintain and detach.