The invention discloses artificial soil granular aggregates and a preparation method therefor. The artificial soil granular aggregates are prepared from artificial soil granules through granulation. The artificial soil granules comprise inorganic substances, organic substances and binders. Inorganic substances, organic substances and binders are taken and mixed uniformly, and a mixture is obtained. The mixture is added into a granulator. Water is sprayed and granulation is carried out. Water evaporation is carried out and the artificial soil granular aggregates are prepared and obtained. The artificial soil granular aggregates have soil granule structures, and can replace soil as a plant culture medium. Medium loss is not easy during the irrigation process, contradiction of consumption and accumulation of medium nutrients can be coordinated, the culture medium temperature can be adjusted, and growth and extension conditions of plant roots can be improved. In addition, the artificial soil granular aggregates can be used for rainwater recovery as a filtering medium.