The present invention discloses a compressor device with an automatic suction function for a dental unit chair. The present invention comprises: a first compression-first compressor which has first and second three-directional motor-operated valves installed at an entrance and an exit respectively, and depending on the operating mode, sucks in and pressurizes the outside air, or creates a vacuum in a vacuum tank, wherein the first and second three-directional motor-operated valves each have a port communicating with the outside； a second compression-first compressor which has third and fourth three-directional motor-operated valves installed at an entrance and an exit respectively, and creates a vacuum in the vacuum tank or sucks in and pressurizes the outside air； a pressurizing tank whose exit is connected to a unit chair, and which is filled with the air pressurized at the first compressor, or the first and second compressors； a vacuum tank whose entrance is connected to the unit chair, and which has installed at an exit a fifth three-directional motor-operated valve communicating with the outside, and in which a vacuum is created at a selected pressure by the second compressor, or the first and second compressors； and a control unit which controls the operations of the above components. Since the present invention is configured in a single body without an additional vacuum pump and performs, independently or simultaneously, air pressurization and vacuum creation necessary for the unit chair by using the compressors alone, it is possible to minimize the space required for installation in an exam room, and also to reduce the production cost of the unit chair by reducing the manufacture cost.본 발명은 치과 유니트 체어용 전자동 석션 겸용 콤프레서 장치를 개시한다. 본 발명은 1개의 포트가 외부와 통하는 제1 및 제2의 3방향 전동밸브를 입구와 출구에 각각 구비하고, 구동모드에 따라 외기를 흡입하여 압축하거나 진공탱크에 진공을 형성해주는 압축 우선의 제1콤프레서； 1개의 포트가 외부와 통하는 제3 및 제4의 3방향 전동밸브를 입구와 출구에 각각 구비하고, 구동모드에 따라 진공탱크에 진공을 형성해주거나 외기를 흡입하여 압축시키는 진공 우선의 제2콤프레서； 출구가 유니트 체어와 연결되
