The utility model discloses an oral cavity rinser relates to medical instrument technical field, and it includes the handle, and soft sheath pipe is equipped with in the handle interpolation, and soft sheath the intraductal flushing pipe and negative pressure backflow pipeline and leaded light of being provided with restraint, flushing pipe's trailing end connection flush fluid, negative pressure backflow pipeline trailing end connection negative pressure source, interface connection is restrainted to tail end and leaded light that the leaded light was restrainted. Be provided with the flush fluid control valve that is used for controlling the interior liquid velocity of flow of flushing pipe on the handle, be provided with negative pressure adjusting valve between negative pressure backflow pipeline tail end and the negative pressure source. The utility model discloses can solve the problem that bad news consuming time were done all can and the increase patient is painful when patient's postoperative of implementing oral operation washed to the oral cavity.