The invention discloses a connection structure of steel bars of a prefabricated parapet. Single row galvanized corrugated steel pipes are embedded into the center in the prefabricated parapet; the top of the galvanized corrugated steel pipe is closed; lapped beam embedded single row steel bars are prefabricated on a roof; the single row steel bars extend out of the prefabricated lapped beam of the roof and are arranged in the single row galvanized corrugated steel pipes; an upper part slurry outlet and a lower part grouting hole are also formed in the single row galvanized corrugated steel pipes. The prefabricated parapet with single row galvanized corrugated steel pipes being embedded is easily butted with the steel bars extending out of the roof lapped beam during field hoisting, the hoisting is quickened, and the construction period is shortened, and as the single row galvanized corrugated steel pipes are adopted, the field grouting efficiency is improved.