The invention relates to a composition for preparing a flexible water permeable brick and the flexible water permeable brick. The composition comprises silica sand, a hydrophilic binder and a flexible binder, wherein regarding to 100 parts by weight of the silica sand, the content of the hydrophilic binder is 0.1 to 10 parts by weight, and the content of the flexible binder is 0.1 to 10 parts by weight. The composition provided by the invention contains both the hydrophilic binder and the flexible binder; according to the water permeable brick prepared by the composition, on the premise of ensuring a water permeation effect, the flexibility and the abrasive resistance of surface layer aggregate particles are improved, the transportation construction loss is reduced, the abrasion performance of a brick surface layer is improved, and the service life of the water permeable brick is prolonged. The water permeable brick provided by the invention can be applied in all water permeable brick application occasions, and can be extended to sports competition places such as playgrounds so as to replace a plastic runway.