A ventilatory laryngoscope with disposable laryngoscope blade having a scrubbing function, comprising a laryngoscope handle and a laryngoscope blade, wherein the laryngoscope blade is movably connected with the extension arm on the end of the laryngoscope handle, the extension arm is arranged in a laryngoscope blade cavity (2.3), a transparent blade protecting cover is arranged on the end surface of the closed front end (2.3.2) of the laryngoscope blade cavity (2.3), an oxygen injecting through-hole is arranged on the transparent blade protecting cover; an oxygen supply pipe extends from the laryngoscope handle cavity (2.3) to extension arm tail end (3.1) along the top of the laryngoscope handle, the oxygen supply pipe is further fixed on the top of the extension arm from the extension arm tail end (3.1) to the extension arm cavity, and in seal plug connection with the oxygen injecting through-hole, or the oxygen supply pipe is fixed from the extension arm cavity to the top of the extension arm (3.2) along the extension arm tail end (3.1), and in seal plug connection with the oxygen injecting through-hole, and another end of the oxygen supply pipe is connected with or inserted into an oxygen source pipe; a scrubbing nozzle is arranged on the transparent blade protecting cover; a scrubbing air pipe is arranged in the laryngoscope handle, one end of the scrubbing air pipe is connected with an oxygen source, another end of the scrubbing air pipe is inserted from the extension arm tail end (3.1) to the top of the extension arm (3.2) and fixed therewith, and in sealed and movable connection with the scrubbing nozzle, the opening of the scrubbing nozzle aligns with the mirror surface of the transparent blade protecting cover; the laryngoscope blade comprises a disposable laryngoscope blade body (2.1), a tongue depressor (2.2) and a laryngoscope blade cavity (2.3); the laryngoscope blade body (2.1) is in a straight or bent shape; a fixing lug or a buckle (2.4) is arranged on the tail end of the laryngoscope blade body (2.1), the fixing lug or the buckle (2.4) is movably buckled with the slot of the extension arm tail end (3.1); the tongue depressor (2.2) is connected with the front end of the laryngoscope blade body (2.1), the laryngoscope blade cavity (2.3) is located inside the laryngoscope blade body (2.1), the end port of the tail end of the laryngoscope blade cavity (2.3) is open, the end port of the front end of the laryngoscope blade cavity (2.3) is closed, and the transparent blade protecting cover is arranged on the end surface of the closed end port of the front end of the laryngoscope blade cavity (2.3); an oxygen supply solenoid valve is arranged on the oxygen supply pipe in the laryngoscope handle; or the oxygen supply solenoid valve is arranged on any position of the oxygen source pipe; a scrubbing control valve is arranged on the scrubbing air pipe, the scrubbing control valve is arranged on the laryngoscope handle; and the scrubbing control valve is interlock controlled with the oxygen supply solenoid valve, when the scrubbing control valve is opened, the oxygen supply solenoid valve is closed, and when the oxygen supply solenoid valve is opened, the scrubbing control valve is closed; a light source is arranged on the top of the extension arm, and the light source is arranged on the inner side of the transparent blade protecting cover.