The invention discloses a sintered water-permeable brick which is not blocked easily. The brick comprises a surface material and a bottom material, wherein the bottom material comprises the main raw materials of: in parts by mass, 80-100 parts of aggregate, 3-12 parts of a bonding base material, 3-12 parts of liquid glue and 0.1-5 parts of glaze, and the surface material comprises the following main raw materials of: in parts by mass, 0-30 parts of the aggregate, 0-4 parts of the bonding base material, 0-4 parts of the liquid glue, 0-2 parts of the glaze and 0-4 parts of color materials; the bonding base material is one or more of bentonite and clay, and the liquid glue is one or more of a silica sol solution, a polyacrylamide solution and a guar gum solution. Correspondingly, the invention discloses a preparation method of the sintered water-permeable brick. The water-permeable brick has high strength, strong frost resistance and excellent water permeability, particles or fiber substances in rainwater and other sewage are not hung on walls easily, and hole gaps of the water-permeable brick are not easily blocked.