The present invention relates to an automatic wet suction apparatus for a dental unit chair. The present invention includes: a water-sealed vacuum pump having a sealing water inlet, an air inlet, and an outlet through which a fluid sucked through the sealing water and air inlets is discharged； a cyclone centrifugation means having an upper end connected to the air inlet of the water-sealed vacuum pump, having an upper end portion circumference connected to a suction tip of the unit chair, separating air and foreign matter-containing dirty water sucked from a patients oral cavity, and removing the separated dirty water； and a sealing water recirculation unit provided with a sealing water tank having a lower end connected to the sealing water inlet of the water-sealed vacuum pump, having an upper end portion circumference connected to the outlet of the water-sealed vacuum pump, and having a discharge port at the upper end thereof, a cooling means cooling sealing water supplied from the sealing water tank to the water-sealed vacuum pump, and a sealing water quantitative supply pump supplying a predetermined amount of the sealing water in the sealing water tank at a time to the water-sealed vacuum pump. According to the present invention, foreign matter such as saliva and bloody pus sucked from the patients oral cavity can be reliably separated from the air, and thus sealing water contamination can be reliably prevented. In addition, the sealing water is appropriately cooled through heat exchange with the discharged and constant-temperature foreign matter and recirculated, and thus sealing water consumption can be significantly reduced. Furthermore, the separated foreign matter can be automatically and easily discharged in a vacuum-formed state even without the apparatus being halted.본 발명은 치과 유니트 체어용 전자동 습식 석션장치를 개시한다. 본 발명은 봉수유입구와, 공기유입구와, 봉수 및 공기 유입구를 통해 흡입된 유체가 배출되는 배출구를 갖는 수봉식 진공펌프； 상단이 수봉식 진공펌프의 공기유입구와 연결되고, 상단부 둘레가 유니트 체어의 석션팁에 연결되어서 환자의 구강으로부터 흡입된 이물질이 포함된 오수를 공기
