The invention discloses a siphon drainage installation technology. The siphon drainage installation technology comprises the steps that a grounding steel column is mounted on the ground and an L-shaped siphon is mounted in the grounding steel column after concrete pouring; the L-shaped siphon, a first siphon, the grounding steel column and a vertical steel column are sequentially welded in a counterpoint mode; a crotch steel column and the vertical steel column are welded in a counterpoint mode, a plurality of tip columns distributed in a crotch shape are arranged at the upper end of the crotch steel column, the tip columns comprise at least one siphon top column, and a second siphon penetrates through upper end openings of the siphon top columns; the second siphon and a third siphon, thesiphon top columns and an oblique stayed steel column and the oblique stayed steel column and a roof joint are sequentially welded in a counterpoint mode; and after the first siphon the second siphonare welded in a counterpoint mode from a manhole of the crotch steel column, the concrete is poured into the vertical steel column and the grounding steel column to the manhole, and a steel plate seals the manhole immediately. According to the siphon drainage installation technology, built-in installation of a siphon drainage pipe is realized, the installation technology is simple, realization iseasy, installation time is shortened, equipment materials are saved, and the safety is high.