The invention discloses a capillary-level flow rate regulator for a miniature-irrigation system. The technical design proposal of the invention comprises a three-way shell, wherein the two water outlet pipes of the three-way shell are respectively screw-connected with a large screw cap, the water inlet pipe is screw-connected with a small screw cap, the two water outlets of the three-way shell are respectively provided with an elastic core print seat in close fit, a section of elastic flat pipe extends into the pipes from each elastic core print seat. In the invention, two elastic flat pipes are arranged inside the two water outlet pipes to automatically regulate the flow rate, thus having the advantages of simple structure, excellent commonality and convenient installating, demounting and rinsing, and being particularly suitable for below-film drop irrigation.