A special test cable for transformer comprehensive test includes a main insulating layer, a main shielding layer, an outer sheath layer, and multiple cable cores arranged in the main insulating layer.Each cable core includes a center conductor, a center insulating layer, a center semi-conductive shielding layer, an outer conductor layer, an outer conductor semi-conductive shielding layer and an outer conductor insulating layer, wherein the center conductor, the center insulating layer and the center semi-conductive shielding layer are arranged in sequence from inside to outside and are integrally molded by a plastic extruding machine, the outer conductor layer is arranged on the center semi-conductive shielding layer, and the outer conductor semi-conductive shielding layer and the outer conductor insulating layer are arranged on the outer conductor layer in sequence. The main insulating layer is arranged in an extruding manner outside the cable cores by a plastic extruding machine. The main shielding layer is arranged outside the main insulating layer. The outer sheath layer is arranged outside the main shielding layer. The number of times of wire replacement and connection in theprocess of transformer field test is greatly reduced, and the field labor intensity is reduced. The special test cable is suitable for measuring the insulation resistance, DC resistance, capacitanceand dielectric loss factor of a transformer, testing the frequency response characteristic of the windings, and the like at the same time.