Disclosed is an injector for the trunk of a tree with enhanced drug injection efficiency. The injector for the trunk of a tree according to the present invention comprises: a wedge-shaped connection pipe having a needle shaped pointed end part in which one or more inlet holes are formed a setting pipe which is coupled to the wedge-shaped connection pipe, and in which a closure preventing rod is inserted inside and an accommodating container in which an entrance is sealed with a vessel cap. A drug injection method of the injector for trunk of a tree comprises the following steps: the porous closure preventing rod is inserted into an injection hole punched in a tree the setting pipe and the wedge shaped connection pipe are connected the injector for trunk of a tree is settled by penetrating the vessel cap of the accommodating container by using the pointed end part of the wedge shaped connection pipe the drug inside the accommodating container is flowed into the inlet holes, passed through an inner hollow of the wedge shaped connection pipe, and directly injected into the tree through the closure preventing rod.COPYRIGHT KIPO 2016수간 주입기가 개시된다. 본 발명에 의한 수간 주입기는 하나 이상의 유입열공이 형성된 침상(針狀)의 첨단부를 갖는 쐐기형 연결관과, 상기 쐐기형 연결관에 체결되며 내부에 폐쇄방지 막대가 삽입되는 거치관과, 입구가 용기 마개로 밀폐되는 수용용기를 갖는다. 수목에 천공된 투여공에 다공성의 폐쇄방지 막대가 삽입되고 거치관과 쐐기형 연결관을 체결한 다음, 수용용기의 용기 마개를 쐐기형 연결관의 첨단부에 의해 관통시킴으로써 안착시킨다. 수용용기 내부의 약물은 유입열공으로 유입되어 쐐기형 연결관의 내부 중공을 거쳐 폐쇄방지막대를 통해 수목으로 직접 투여된다.
