Preparation method of blast furnace granulation slag water-permeable brick

The invention discloses a preparation method of a blast furnace granulation slag water-permeable brick. According to the invention, blast furnace granulation slag, slag micro-powder, fly ash, cement, and an exciting agent are adopted as raw materials of the water-permeable brick; the materials are well mixed by using water, and vibration compression molding is carried out; and steam curing or natural watering curing is carried out, such that a water-permeable brick finished product is obtained. According to the invention, blast furnace granulation slag characteristics of multiple edges and recesses on surface, uniform particle size, and high stacking porosity are utilized for preparing the water-permeable brick. According to the water-permeable brick produced with the method, blast furnace granulation slag is used for completely replacing gravel, and water-permeable brick surface layer is not needed to be specially prepared. The brick has the advantages of low production cost, good filtering effect, good water permeability, good appearance, high slag consumption, and the like.