The invention provides an ecological greening building member and belongs to the field of greening buildings. The ecological greening building member comprises a base plate. A plurality of construction units are arranged on the base plate and comprise hooks used for hanging flower baskets in an abutting mode; water storage tanks are arranged below the hooks and internally provided with water absorption cotton threads; the top ends of the water absorption cotton threads form water outlet ends and extend to the positions between the water storage tanks and the hooks; and after flower pots are placed in the flower baskets and the flower baskets are hung on the hooks in the abutting mode, the water outlet ends can be connected to the flower pots. The ecological greening building member is applied to a greening building, arrangement of greening potted plants can be facilitated, the building construction efficiency of the greening building is promoted, and the greening potted plants can obtain water supplies efficiently and continuously so that the maintenance period can be shortened.