Transformation method of outdoor sewage discharge system of old community

The invention relates to a transformation method of an outdoor sewage discharge system of an old community, and the discharge system comprises a plurality of original inspection wells arranged outside a building, original outdoor pipelines for connecting the original inspection wells and the building, and original main pipelines for connecting the adjacent original inspection wells, the transformation method comprises the following steps that a groove is dug in the ground outside the building, and the groove and the original main pipeline are arranged in parallel; a plurality of newly-made inspection wells and newly-made main pipelines are installed in the groove, and the newly-made main pipelines are connected with the newly-made inspection wells; the groove is backfilled, and a pipe groove is excavated between the building and the newly-made inspection well; the discharging system is closed, the original house-out pipeline is dismantled, a new house-out pipeline is installed in the pipe groove, and the new