Pipeline connecting structure for anti-seepage construction of ultra-deep buried composite pipeline

The present application discloses a pipeline connecting structure for anti-seepage construction of ultra-deep buried composite pipeline. The pipeline connecting structure comprises a supporting plate, a left connecting plate, a right connecting plate, a supporting device, a positioning device and a sealing device. The supporting device comprises baffles, a communicating groove, a supporting base, mounting plates, clamping grooves, a clamping plate, a connecting hole, a fixing bolt, a telescopic pipe, a limiting plate, a spring and a protection pad. The baffles are fixedly connected to the two sides of the top end of the supporting plate, one end of each baffle is fixedly connected with a mounting plate, and a clamping groove is formed in each mounting plate. A connecting ring at one end of the left connecting plate is aligned with a connecting groove, a sealing ring is placed in a sealing groove between the two connecting blocks, and then the left connecting plate and the right connecting plate are fixed thro