Cable pre-embedding construction method for upgrading and reconstruction of old community

The invention discloses a cable pre-embedding construction method for upgrading and reconstruction of an old community, and the method employs a form of excavating and arranging pipes when a laying section is a section where the positions of pipes on a newly reconstructed road are relatively tight and conflicts with other pipelines, and comprises the following steps that: S1, according to the position of a field construction measurement defense line, the manual exploration and excavation of three points is carried out to expose underground obstacles, a pipe ditch penetrating through a pipeline and a cable is excavated manually, and the excavation depth reaches the designed bottom elevation; and S2, before the road surface is excavated, a buried pipe width edge line is marked with a defensive line, then two boundary kerfs are excavated in the cement road surface through a cutting machine, and then the road is mechanically crushed and excavated. According to the requirement of a cable line laying path and diffe