the present invention, a syringe and needle separate syringe at a fixed state of being connected to each other only the piston is relatively light needle only through the operation of the other motor while reciprocating soon as moving forward through the driving of the motor before and after the chemical solution is injected into the low noise operation of the characters and the chemical liquid of the needle can be made fast and precisely with the syringe and discharged and will, depending on the connection to the orifice structure, and a step portion formed on the connection structure of the chemical unit of the needle is lost in the skin treatment device can be effectively prevented. Skin treatment device according to the present invention, the upper guide is provided with a syringe needle installed forward the installation cost to be movable front and rear, and the rear top of the piston grasp a before and after being installed to be movable bottom provided with a handle which is operated switch installed a body which, detachably coupled to the guide on the syringe body and a syringe piston which is coupled to the piston grasp, and the needle is coupled to the front of the mounting base of the needle body, the rear of the front end and the needle of the syringe connecting unit configured to connect the end portions, and a first linear transfer unit is installed in the mounting base for moving the needle back and forth and from the of the body, installed inside the main body and the second linear transport for moving the piston forward grasp unit, mounted to the body and comprises the first and a controller for controlling the operation of the second linear transport unit according to the operation and the operation of the setting unit sets the operating switch.본 발명은, 주사기와 니들이 서로 분리연결됨으로써 주사기는 고정된 상태에서 비교적 가벼운 니들만 모터의 구동을 통해 전후왕복이동됨과 동시에 또 다른 모터의 구동을 통해 피스톤만 전진이동되어 약액이 배출됨에 따라 작동소음이 적고 니들의 자입과 약액의 주입이 빠르면서 정확하게 이루어질 수 있으며 주사기와 니들을 연결하는 연결유닛에 오리피스구조부 및 단차구조부가 형성됨에
