Sealing joint for sealing prestressed plastic pipe and prestressed plastic pipeline

The utility model relates to a sealing joint for sealing a prestressed plastic pipe and a prestressed plastic pipeline. The pipe wall of the prestressed plastic pipe comprises annular grooves, annular protrusions and protrusion channels, wherein the annular grooves and the annular protrusions are alternately arranged, and the protrusion channels penetrate through the annular grooves and the annular protrusions. The sealing joint comprises a sleeve which comprises at least two end openings used for being respectively inserted with a prestressed plastic pipe; one set of fixing pieces is arranged in each end opening, one ends of the fixing pieces abut against the inner wall of the sleeve, and the other ends of the fixing pieces face the middle of the sleeve and abut against the inner side wall of the annular groove; and each group of sealing gaskets are respectively positioned in the branch pipes corresponding to the end openings, the sealing gaskets are detachably fixed on the inner wall of the sleeve along the