Busbar expansion joint

The invention relates to a busbar expansion joint, which is arranged between two sections of busbars which are longitudinally arranged along a line and are arranged in parallel at a fixed interval in a rigid contact network system, and is provided with a guide plate and an electric connection device, the inner side face of each flow guide plate is provided with a sliding groove extending towards the two ends, the inner side faces of the two flow guide plates are opposite, the two flow guide plates are arranged side by side at intervals, and a clamping structure capable of sliding relatively is formed between the two flow guide plates through guide sliding blocks embedded into the sliding grooves. The two sections of busbars are located at the two ends of the clamping structure respectively and fixedly connected to the different flow guide plates respectively; the electric connection device is arranged on the top or the side face of the clamping structure and electrically connects the two flow guide plates. By