The invention discloses a connector of a main liquid inlet pipeline, a main liquid return pipeline and a water inlet pipeline used for a hydraulic support, and belongs to the field of pipeline connectors for hydraulic supports used for coal mines. The connector comprises a joint and a liquid distributing plate, a first hole set, a second hole set and a third hole set are formed in the liquid distributing plate and form a V-shaped tee joint, the first hole set, the second hole set and the third hole set are evenly distributed in the liquid distributing plate in the same-phase mode along the axis of the liquid distributing plate, and the joint is connected in the middle point of the second hole set. According to the structure of the connector, the form and functions of a traditional elbow pipe structure are combined to the polygonal liquid distributing plate, so that the connector is compact in structure and easy to machine; the connector is compact in structure, a welding joint is only used at the connection position (at low pressure) of the joint and the liquid distributing plate, and other joints are concentrated in the polygonal plate and formed through direct drilling, so that machining accuracy of a sealing face is easy to ensure, welding quantity is greatly reduced in comparison with a traditional structure, and high-pressure liquid leakage caused by welding deformation and welding defects of the sealing face can be reduced.