Self-adjustment construction method for prefabricated culvert

The invention discloses a self-adjustment construction method for a prefabricated culvert. The method includes the following operation steps that upper box culvert sections and lower box culvert sections are prefabricated in a factory; a groove is excavated in a construction site, and a bottom board is arranged at the bottom of the groove; the lower box culvert sections are placed on the bottom board, and the multiple lower box culvert sections are arranged side by side and fixed to one another; the multiple upper box culvert sections are placed on a U-shaped rail through a crane and slowly pulled through a tractor, the multiple upper box culvert sections are fixed to one another into a whole, and the upper box culvert sections fixed into the whole and the lower box culvert sections fixed into a whole are fixed to each other; and backfill soil is used for covering operation, and construction operation is finished. In the construction process, the top of the groove is covered with a construction covering board