The invention relates to a modular pipeline installation method, which relates to the field of pipeline installation, and comprises the following steps: S1, determining the size of a pipeline, adjusting the position of a support ring in a mold frame according to the size of the pipeline, adjusting the opening size of the support ring, and ensuring that the support ring is matched with the pipeline; s2, two supporting rings are fixed, and the two supporting rings are fixed in a split bolt fixing mode; s3, a rubber ring is installed, a rubber ring bag with glue is placed at the position of the pipeline inserting opening, and the rubber ring bag is arranged in a circle and adheres to the inner wall of the pipeline inserting opening; and S4, pipelines are installed, the two mold frames are fixed in a butt joint mode, the two pipelines are fixed in a pipeline inserting mode, and after the rubber rings are broken, the glue is distributed at the pipeline connecting positions. The supporting ring has the effect of conveniently adjusting the size and position of the supporting ring, so that the effect of matching pipelines of different specifications is achieved, and the great market value is achieved.