The invention discloses a high-strength unfired water-permeable brick and a preparation method thereof. The unfired water-permeable brick is prepared from barren granules, cement, rodlike mineral and a binder, wherein the unfired water-permeable brick contains 2-4wt% of rodlike mineral. The invention provides the high-strength unfired water-permeable brick. The rodlike mineral is added, so that the fracture resistance is provided in a non-vertical direction while an internal water-permeable space is increased, and the strength of the unfired water-permeable brick is thus greatly improved. In addition, the invention further provides the preparation method of the unfired water-permeable brick. Implementation can be carried out without modification of existing procedure or equipment.