Butt joint piece and shutoff valve

The utility model relates to the field of shutoff valves, and particularly discloses a butt joint piece and a shutoff valve, the butt joint piece comprises a connecting pipe and a pipeline, the shutoff valve is fixedly connected to the side wall of one end of the connecting pipe, sliding grooves are formed in the side walls of the left end and the right end of the connecting pipe, a rotating groove is formed in one end of each sliding groove, and a baffle is fixedly connected to the side wall of the inner end of the connecting pipe; a first positioning hole is formed in the side wall of one end of the baffle. A pipeline is inserted into a connecting pipe, a sealing gasket makes contact with the outer wall of a baffle, meanwhile, the pipeline is rotated, and a connecting block enters a rotating groove through a slope of the rotating groove, so that the connecting block drives the pipeline to move into the connecting pipe again, the pipeline is preliminarily connected to the connecting pipe in a sealed mode, an