The invention relates to a pressure plate joint with internal teeth for automobile air conditioner pipelines, particularly is a pressure plate joint used for allowing various pipelines of an automobile air conditioner to be connected, and belongs to the technical field of connecting pieces. The pressure plate joint comprises a pressure plate body, wherein a joint hole adopting an internal tooth-shaped structure is formed in the pressure plate body; the two ends of the pressure plate body are a large circular arc and a small circular arc respectively; internal teeth of the joint holes are distributed uniformly. The pressure plate joint has a simple, compact and reasonable structure, and avoids the risk of welding spot leakage caused by the welding and processing, the production cost is reduced, and the use is convenient.