PURPOSE: A vegetation block and a building greening system using the same are provided to effectively supply water necessary for the growth of bryophyte. CONSTITUTION: A water absorber(30) absorbs and stores water. A vegetation mat(40) is planted with bryophyte on the surface. The vegetation mat is laminated to touch one side of the water absorber on the rear side, and supplies water absorbed and stored in the water absorber to the surface. A fixing net(80) is installed on the surface of the vegetation mat so as to prevent bryophyte planted on the vegetation mat from dropping out. Multiple vegetation blocks are arranged on a building to the width and lengthwise, and planted with bryophyte. An irrigation device supplies water necessary for the growth of the bryophyte planted on the vegetation block. An insulating material is laminated on the other side of the vegetation blocks so as to be interposed between the building and the vegetation blocks. The insulating material has grooves in which the vegetation blocks are inserted. A water drainage block is laminated on the other side of the vegetation blocks so as to be interposed between the building and the vegetation blocks, and has at least one drain hole.본 발명은 수분을 흡수하는 수분흡수체, 수분흡수체에 이면이 접촉하도록 적층되어 수분흡수체에 저장된 수분을 표면 측으로 공급하는 이끼식물 식재용 식생매트, 식생매트에 포설되어 식생매트에서 식재되는 이끼식물의 탈락을 방지하는 고정네트로 구성된 식생블록 및 이 같은 식생블록을 이용하는 건축물 녹화 시스템을 제공한다.
