The invention relates to a vertical horizontal dual-function coupler based on elliptical multi-mode interference comprising an elliptical multi-mode interferometer, an optical grating coupler used forperforming vertical coupling , and an end surface coupler used for performing end surface coupling; the optical grating coupler and the end surface coupler are respectively connected with the elliptical multi-mode interferometer, wherein the optical grating coupler and the end surface coupler are used in a time-sharing mode, and the elliptical multi-mode interferometer is optimized for one main input waveguide or is balanced for two channels. According to the vertical horizontal dual-function coupler in the invention, the test of the silicon wafer machining process can be satisfied, and the effect during final packaging is not influenced.