Sliding contact line support auxiliary construction device and sliding contact line installation construction method

The invention discloses a sliding contact line support auxiliary construction device which comprises a suspension cage, a vertically-arranged suspension rod is fixedly connected to the side face of the front side of the suspension cage, suspension idler wheels are vertically arranged on the side face of the front side of the suspension rod at intervals, an adjusting sliding sleeve extending front and back is fixed to the top of the suspension rod, and a supporting transverse rod is arranged in the adjusting sliding sleeve in a penetrating mode. A rail connecting sliding base and a supporting roller are fixed to the rod body, located in front of the adjusting sliding sleeve, of the supporting transverse rod, a sliding rail is vertically fixed to the inner bottom face of the lifting cage, a sliding base is slidably connected to the sliding rail, a lifting base and a sliding base lifting device are fixed to the top of the sliding rail, and the sliding base lifting device can drive the sliding base to move up and