The invention discloses a pipeline docking device for sewage treatment, which comprises a fixed frame body, a supporting bracket body and a lifting assembly, two supporting bracket bodies are provided, and the two supporting bracket bodies each include a chute frame, a Rod and bracket plate, the two support rods are respectively located at the remote ends of the two chute frames, the bracket plate is connected with the chute frame through the support rod, and the two bracket plates are provided with arc-shaped blocks to support The bottom of the bracket body is provided with a buffer block, the support bracket body is connected with the fixed frame body through the buffer block, and the lifting assembly is connected with the fixed frame body. The lifting assembly includes a fixed block, a lifting cylinder and two lifting chutes. The invention has strong practicability, reasonable structural design and convenient operation, which makes the butt joint between the pipelines more precise, thereby facilitating the welding between the pipelines, improving the quality of the pipeline after welding, improving the tightness of the connection between the pipelines, and avoiding the transmission of sewage Leakage occurs during the process, which effectively improves the comprehensive utilization rate.