The invention discloses a light composite insulating rod with good operation stability for a loop resistance test. The light composite insulating rod comprises a first section including a wiring clamp, a plurality of middle sections of insulating rods, a bottom insulating rod, and a tail joint, a transition joint is arranged between the first section and the middle sections of the insulating rods, a test current wire is directly poured into a glass fiber epoxy resin composite insulating rod to form current-guiding copper conductors, the current-guiding copper conductors in each insulating rod are connected via copper threaded joints at two ends of the conductors, a test voltage wire penetrates through the middle of the insulating rod, the current wire is connected with the wiring clamp at the top of the first section of the insulating rod, the current wire and the voltage wire are led out from the tail joint and connected with a loop resistance test apparatus, and the voltage wire is pressed in from a side wire slot of the tail joint. According to the light composite insulating rod, the structure is reasonable, the operation stability is good, and the usage is safe.