The rainwater collection module is a part of the sponge rainwater collection and utilization system. Several rainwater collection module units are combined to form an underground storage tank. Wrap anti-seepage geotextiles or permeable geotextiles around the pool according to engineering needs to form different types of storage pools, infiltration pools, and flood control pools. The storage tank of the rainwater collection module can effectively store the collected rainwater. After treatment, the stored rainwater resources can be used for flushing toilets, cleaning roads, watering lawns, replenishing water features, and even circulating cooling water and firefighting water.