Provided is a safe injector for the trunk of a tree which: is easy to use by having a simple configuration enables a user to use other drugs or reuse a drug even after being inserted into a puncture on a tree prevents children from separating or easily removing a lid from a main body by not allowing the children to separate the lid from the main body can be safely used by the user without leaking the drug when being used by not being easily removed from the tree when mounting to the puncture on the tree and has a protection cover so that the children cannot taste the drug through a through hole formed on the bottom of the main body to be communicated with an air inlet hole. The injector for the trunk of a tree comprises the main body (100) and the lid (200). The main body (100) includes: a cylinder shaped support unit (110) a body (120) including a storage unit (121) which stores a drug therein a screw thread (130) formed at one outer portion of the body (120) and an air inlet pipe (140) coupled to an upper portion of the through hole (111) of the support unit (110). The lid (200) includes: the cover (220) having a corresponding screw thread formed on an inner peripheral surface thereof to be screwed with the screw thread (130) a roof (230) having a valve (231) including a space surrounding an upper end of the air inlet pipe (140) and a cylindrical shaped hollow injection pipe (210) coupled to an upper portion of the roof (230).COPYRIGHT KIPO 2016본 발명은 구성이 간단하여 사용이 간편하고, 수간주입기를 천공에 삽입한 후에도 다른 약액를 사용하거나 재사용 할 수 있으며, 또한 뚜껑을 본체에서 분리할 수 없어 어린아이들이 분리하거나 쉽게 제거할 수 없으며, 나무의 천공에 장착되면 쉽게 제거할 수 없어 사용 시 사용자에게 약액 누출 없이 안전하게 사용할 수 있고 어린 아이들이 공기 유입공과 연통되도록 본체의 바닥에 형성되어 있는 관통공을 통하여 약액을 맛 볼 수 없도록 보호덮개가 있는 안전한 수간주입기를 제공한다.
