The invention provides a multi-functional distribution line rod top maintenance support bar. The support bar comprises a rocking handle, a bevel gear 1, a bevel gear 2, a nut, a lead screw, an extension pipe, an insulation fulcrum bar, a U-shaped fork, an irradiation lamp, a pulley, a rotating shaft, a bearing 1, a gearbox, an end cap and a support seat. The rocking handle is fixedly connected to the bevel gear 1. An upper portion of the bevel gear 2 is fixedly connected to the nut. The lead screw and the nut are connected through a rectangular thread. The lead screw is provided with the extension pipe. An upper end of the extension pipe is connected to the insulation fulcrum bar. Through arranging the irradiation lamp, the extension pipe, the bevel gear 1 and the bevel gear 2, usage functions are perfect, a height adjusting amount is increased, the support bar is stable and reliable, night usage and operation are convenient, the support bar is easy to carry, a usage range is enlarged, and popularization and usage are convenient.