Chemical liquid injection device according to the present invention,
A first screw thread formed in the body; A second screw thread which is screwed with the first screw thread is formed so as to be movable back and forth with the rotation of the main body, the connector is a first hole through which the needle passes is formed; A lid detachably coupled to the rear end of the connector; It is coupled to the connector, confidentiality silicone a second hole for the needle to pass through said first hole is formed; The confidentiality is positioned on the front side of the silicon, the third hole is formed to a needle guide needle is passed through said second aperture; And is positioned at the front side of the needle guide, a slit valve for a needle to pass through said third hole is formed; includes,
When the connector advancing the front end of the confidentiality silicon entering pushed inside the third hole of the needle guide the confidentiality silicon of the second hole is narrower blocked, when the connectors are backward the rear end of the confidentiality silicon the needle guide naohmyeonseo out of the third hole to the outside is characterized in that the second hole of the confidentiality silicon beoleojyeo open.