The straddle type monorail side contact π type bus bar is installed on the side of the track beam, which is located in the middle of the PC beam and is completely enveloped by the car body. It is arranged in a vertical zigzag shape along the line direction to make the pantograph wear evenly. The system has the advantages of less space occupation, small turning radius, low noise, strong slope climbing, strong adaptability to terrain and short construction period. π - type busbar relies on its own jaw tension clamp to connect the contact line, and the contact wire can be clamped into the clamp of π - type busbar by special pay off trolley, which is convenient for construction, greatly improves the efficiency and accuracy of construction and installation, saves human resources, and helps to reduce the operation and maintenance cost.