The present invention relates to a shock absorption type safety blade unit for a brush cutter with a protection unit. The shock absorption type safety blade unit for a brush cutter with the protection unit includes: a housing fixed to a driving shaft of a driving unit installed at an end of a worktable and rotating with the driving shaft； multiple cutter units installed in the housing and protruding to the outside of the housing to cut weeds as the housing rotates, wherein the multiple cutter units are transformed to be inserted into the housing to prevent damage when collides with an obstacle； and multiple elastic units arranged in the cutter unit and providing an elastic force to the cutter unit in order for the cutter unit to be returned by protruding to the outside when the cutter unit is inserted into the housing. According to the present invention, the cutter unit is installed to be inserted into the housing, and the elastic unit supports the cutter unit in order for the cutter unit to protrude to the outside of the housing. So, the cutter unit is inserted into the housing when colliding with a structure or gravel. Therefore, the shock absorption type safety blade unit for a brush cutter with the protection unit prevents the gravel from spattering and prevents the cutter unit from being damaged. Also, the shock absorption type safety blade unit for a brush cutter with the protection unit can improve efficiency of a brush cutter by hitting a plant with large power using the elastic force provided from the elastic unit when collides with the large plant.본 발명은 보호구가 장착된 충격흡수식 예초기 안전날 유닛에 관한 것으로서, 작업대의 단부에 설치된 구동부의 구동축에 고정되어 상기 구동축과 함께 회전하는 하우징과, 상기 하우징에 마련되는 것으로서, 상기 하우징의 회전에 따라 잡초를 절단할 수 있도록 상기 하우징의 외측으로 돌출되되, 장애물과 충돌시 파손되는 것을 방지할 수 있도록 상기 하우징의 내측으로 인입되도록 변형되는 다수의 커터부와, 상기 커터부에 마련되는 것으로서, 상기 커터부가 상기 하우징으로 내측으로 인입시 상기 커터부가 외측으로 돌출되어 복귀될 수 있도록 상기 커터부에 탄성력을 제공하는 다수의 탄성부를 구비한다. 본 발명에 따른 보호구가 장착된 충격흡수식 예초기 안전날 유닛은 커터부가 하우징에 인입가능하게 설치되고, 탄성부가 상기 커터부가 하우징 외부로 돌출되게 지지하
