The utility model relates to the technical field of pipelines, in particular to a
water supply and drainage pipeline connecting structure which comprises a bottom plate, supporting plates are fixedly connected to the two symmetrical sides of the upper end face of the bottom plate, first threaded holes are formed in the upper end faces of the supporting plates, and first bolts are connected into the first threaded holes in a threaded mode. A lower supporting seat is fixedly connected to the upper end face of the bottom plate, an upper supporting seat is in
lap joint with the upper end face of the lower supporting seat, a sealing
gasket is fixedly connected between the lower supporting seat and the upper supporting seat, a first connecting
pipe and a second connecting
pipe are slidably connected to the inner wall of the sealing
gasket in a sleeving mode, and a limiting rod is fixedly connected to the back face of the first connecting
pipe. By arranging the supporting frame, the pin shaft, the fixing plate, the hose, the telescopic rod, the
threaded rod and the nut, when the nut rotates, the
threaded rod is driven, the spraying height of the drainage pipe is adjusted, under the action of the pin shaft, the limiting effect on swing of the drainage pipe is achieved, and the situation that the swing amplitude is too large, and pulling is caused is avoided.