The present invention relates to an apparatus for selectively removing attached organisms by using high-pressure water. It is possible to prevent sea water from spreading in accordance with the injection of high-pressure water through an injection unit, only target organisms to be removed, that is, geniculate and crustose corallines are removed, it is possible to protect adjacent leaflike seaweeds, it is possible to improve workability based on securing visibility, it is possible to prevent sliding at the time of working on an inclined surface of rock, and it is possible to rapidly perform the work. The apparatus with such an object comprises: an operation unit which is provided with a trigger for controlling whether to inject high-pressure water supplied through a supply hose by operation of an operator, and is provided with at one end of a hollow injection pipe； a high-pressure water injection gun which includes an injection port installed at the other end of the injection pipe and injecting high-pressure water supplied in accordance with control of the trigger to remove geniculate and crustose corallines； a diffusion prevention member which includes an upper plate and a side plate to block faces other than the bottom to prevent diffusion of floating matters from being diffused at the time of injecting high-pressure water in accordance with control of the trigger by being positioned inside through the injection port of the high-pressure water injection gun； and a connection means, one end of which is connected to the diffusion prevention member, and the other end is provided to rotate at one end of a bar for installation installed on an injection pipe of the high-pressure water injection gun, to absorb shock at the time of high-pressure injection.본 발명은 고압수를 이용한 부착생물의 선택적 제거장치에 관한 것으로, 그 목적은 분사부를 통하여 고압수가 분사됨에 따른 해수의 확산을 방지할 수 있어 제거하고자 하는 대상생물 즉, 유절 및 무절석회류만을 제거하고 인접한 엽상해조류를 보호할 수 있도록 하고, 시야확보에 따른 작업성을 향상시킬 수 있을 뿐만 아니라 암반의 경사면 작업시 미끄러짐을 방지할 수 있어 작업을 신속하게 행할 수 있도록 하
