The invention discloses an odontoscope with water suction and air injection functions. The odontoscope comprises: an odontoscope body, which comprises an odontoscope end, a lens and a connecting end,wherein a first pipeline used for air injection and a second pipeline used for water suction are arranged in the connecting end; a handle pipe, wherein one end of the handle pipe is detachably connected with one end of the connecting end; a first stainless steel pipe, which is used for conveying gas, wherein one end of the first stainless steel pipe is inserted into the first pipeline; a second stainless steel pipe, which is used for water suction, wherein one end of the second stainless steel pipe is inserted into the second pipeline; an injection molding pipe, which is contained in the handle pipe, wherein the first stainless steel pipe and the second stainless steel pipe are arranged in the injection molding pipe. Thus, the odontoscope with the water suction and air injection functionsdisclosed by the invention can check the situation in the oral cavity of a patient, has a water suction function, can suck away water in the oral cavity of the patient, reduces the operation of watersuction in the oral cavity through a weak suction pipe, has an air injection function, and is not prone to being atomized by the breath of the patient.