The invention relates to a multifunctional power transmission line inspection auxiliary apparatus and method, comprising an insulating handle, a stretching rod, an obstacle clearing rod and an obstacle clearing knife. One end of the stretching rod is fixedly provided with the insulating handle, and the other end is provided with a threaded connection port; the stretching rod is internally provided with a power source; the end of the stretching rod with the threaded connection port is provided with an illuminating lamp which is in connection with the power source; the stretching rod is in connection with the obstacle clearing rod and the obstacle clearing knife through the threaded connection port. The multifunctional power transmission line inspection auxiliary apparatus and method increase power transmission line inspection efficiency, provide a guarantee for power transmission line safe and stable operation, maintain company equipment safe operation, meanwhile contribute to stable development of summer peak work, and guarantee normal power supply quality.