Method for cleaning float type rotor flow meter by side surface tapping

The invention discloses a method for cleaning a float type rotor flow meter by side surface tapping. The tapping is performed above a main pipe (1) with a float type flow meter (2), and the tapped place is transversely welded with an L-shaped connecting pipe (3); an upward vertical section of the L-shaped connecting pipe is provided with a manual valve (4); a funnel (5) is arranged at the top of the vertical section of the L-shaped connecting pipe; a water inlet valve (6) on the main pipe is opened; water in the main pipe is emptied firstly; then, the water inlet valve and a manual valve are closed; prepared dilute hydrochloric acid is poured in the funnel; then, the manual valve is opened; the dilute hydrochloric acid flows into the main pipe; after the dilute hydrochloric acid immerses the float type flow meter, the manual valve is closed; and 1-2 minutes later, the water inlet valve is opened to empty the dilute hydrochloric acid. The method can online clean the float type flow meter without assembling, is