The present invention relates to a suction apparatus for dental clinic, and more particularly, to a suction apparatus for dental clinic which prevents waste water sucked in from a suction nozzle when a suction apparatus is in operation from entering into a vacuum pump to conveniently treat the waste water and circulates sealing water for operating the vacuum pump to reuse. The configuration of the present invention comprises: a suction nozzle； a waste water tank to store the waste water sucked in by the suction nozzle: a water ring vacuum pump which contain first and second suction parts and a discharging part to discharge fluid sucked in by the first and second suction parts； a first suction pipe which connects the suction nozzle and the upper part of the waste water tank； a second suction pipe which connects the first suction part of the vacuum pump and the upper part of the waste water tank； a sealing water tank comprising a supply part which is connected to the second suction part of the vacuum pump, a recovery part which is connected to the discharging part of the vacuum pump and a ventilation part on the upper end part. According to the configuration of the present invention, the waste water is stored in the waste water tank, and only air is sucked in by the vacuum pump via the second suction pipe after air and waste water sucked in by the suction nozzle are transferred to the waste water tank via the first suction pipe, thereby preventing contamination in sealing water necessary for operating the vacuum pump and saving water since sealing water can be reused. In addition, waste water and sealing water are not mixed when stored in the waste water tank so that waste water is reduced and waste water treatment is facilitated.본 발명은 치과용 석션장치에 관한 것으로서, 더욱 상세하게는 석션장치의 가동시 석션노즐을 통해 흡입된 오수가 진공펌프 내로 유입되지 않도록 하여 오수의 처리가 용이하고, 진공펌프의 가동을 위한 봉수(sealing water)를 순환시켜 재사용할 수 있도록 한 치과용 석션장치에 관한 것이다.그 구성은, 석션노즐； 상기 석션노즐에 의해 흡입된 오수가 저장되는 오수탱크； 제1 및 제2 흡입부, 그리고 상기 제1 및 제2 흡입부를 통
