A pump structure of a portable oral irrigator and a portable oral irrigator comprising same. The portable oral irrigator comprises: an oral irrigator main engine (5)； the oral irrigator main engine (5) comprises a housing (512) and a pump assembly； the pump assembly is disposed within the housing (512) and is provided with a pump body (55), a driving motor (57), a water outlet nozzle (525) and a water inlet nozzle (514)； a water outlet (51) provided corresponding to the water outlet nozzle (525), and a water inlet provided corresponding to the water inlet nozzle (514) are disposed on the housing (512)； the driving motor (57) is vertically disposed； an output shaft of the driving motor (57) is drivingly connected to the pump body (55) by means of a spur gear (524) and a contrate gear (522)； the contrate gear (522) is vertically and rotationally disposed within the housing (512)； the pump body (55) comprises a pump cylinder (519), a piston rod (520) and a pumping piston head (527)； the pump cylinder (519) is a T-branch pipe； the pumping piston head (527) is disposed in one end of the pump cylinder (519), and the other two ends of the pump cylinder (519) are communicated with the water outlet nozzle (525) and the water inlet nozzle (514)； one end of the piston rod (520) is connected with the pumping piston head (527)； and the other end of the piston rod (520) eccentrically and rotationally cooperates with the contrate gear (522).L'invention concerne une structure de pompe d'un irrigateur oral portable et un irrigateur oral portable le comprenant. L'irrigateur oral portable comprend : un moteur principal (5) d'irrigateur oral ； le moteur principal (5) d'irrigateur oral comprend un boîtier (512) et un ensemble pompe ； l'ensemble pompe est disposé à l'intérieur du boîtier (512) et est pourvu d'un corps (55) de pompe, d'un moteur d'entraînement (57), d'une buse (525) de sortie d'eau et d'une buse (514) d'entrée d'eau ； une sortie d'eau (51) disposée en correspondance avec
