Water-proof structure at pipeline connector and mounting method of water-proof structure

The invention provides a water-proof structure at a pipeline connector and a mounting method of the water-proof structure. Two stainless steel internal expanding circles each of which is formed by connecting at least three sections of arc-shaped stainless steel internal expanding circle bodies are disposed at the two side edges of an annular detachable water stop belt correspondingly, and by adjusting bolt assemblies which penetrate through close bolt holes in the adjacent arc-shaped stainless steel internal expanding circle bodies, the contact surfaces of the annular detachable water stop belt and a pipeline are pressed tightly, so that the effect of improving resistance to water leakage is achieved, and accordingly, the phenomenon of water leakage caused by connector deformation which is prone to occurring due to natural environments, geological conditions and other factors during usage of a part of underground pipelines is avoided. Besides, the water-proof structure at the pipeline connector is composed of