The utility model relates to a plug-in type insulating spring wiring cap, which belongs to the technical field of wiring caps and comprises an insulating cap body, a connecting block is slidably connected to the inner side of the insulating cap body, and a connecting piece is arranged on the insulating cap body. The connecting piece comprises a supporting rod, one end of the supporting rod penetrates through the insulating cap body and is in sliding connection with the insulating cap body, the end, located on the inner side of the insulating cap body, of the supporting rod is fixedly connected with a connecting block, and a connecting spring is fixedly connected between the outer side of the connecting block and the inner wall of the insulating cap body. According to the plug-in type insulation spring wiring cap, after a sliding-down movable ring extrudes a top limiting groove of a limiting rod and a connecting rod drives a rotating block to extrude connecting blocks on the two sides to get close, a plurality of strands of wires can be tightly extruded and fixed to the inner side of a connecting groove, and when the limiting rod slides down along with the movable ring, the limiting rod is extruded into a bottom limiting groove; therefore, a plurality of strands of wires can be locked, and the wiring caps and the wires can be inserted and fixed, so that the connection convenience is improved.