The invention discloses a preparation method of a low-cost ceramic water-permeable brick suitable for low-temperature fast firing. The preparation method includes the steps that (1), after waste glassis subjected to batching, breaking, mixing and ball-milling, a uniform powder mixture is obtained, a small amount of dextrin powder, water and clay are used in assistance, prilling is carried out, and obtained materials serve as a binding agent of the water-permeable brick; (2), architectural ceramic and domestic ceramic waste and waste residues are broken to a certain granularity, and the obtained materials serve as aggregate of the water-permeable brick; (3), sodium silicate water glass is prepared to a certain concentration, then the sodium silicate water glass and the aggregate are fullymixed according to a certain proportion, and sodium silicate water glass coated aggregate is obtained; (4), after the prilled binding agent and the coated aggregate are batched according to a certainproportion, mixed and prilled, distributing-forming and sintering are carried out, finally, surface finishing is carried out, and the ceramic water-permeable brick is obtained. The surface hole diameter and porosity of the water-permeable brick are small, but the internal hole diameter and porosity of the water-permeable brick are large, the situation that surface pores are blocked is greatly reduced, and it is guaranteed that the water-permeable brick can continuously keep a high permeability rate.