Pipeline water stopping device for water conservancy project

The utility model discloses a pipeline waterstop device for hydraulic engineering, which is characterized in that the circumferential outer wall of one end of a first pipe body, the circumferential outer wall of one end of a third pipe body and the circumferential outer walls of the two ends of a second pipe body are fixedly connected with mounting rings, clamping plates are fixedly connected between the outer walls of the opposite ends of the mounting rings, and the inner walls of the two ends of the second pipe body are provided with inserting structures; a rotating groove is formed between the circumferential inner wall and the outer wall of the second pipe body, a plurality of connecting plates are fixedly connected between the outer walls of the two ends of the rotating groove, the circumferential inner wall of a rotating ring makes contact with the circumferential outer wall of the second pipe body, and a sealing plug inserted between the outer walls of the two ends of the rotating groove is fixedly con