The invention relates to an integrated optical waveguide three-dimensional electric field sensor system, and belongs to the technical field of electric field measurement. The integrated optical waveguide three-dimensional electric field sensor system comprises a broadband laser source, an optical fiber coupler, a single-mode optical fiber, an integrated optical waveguide three-dimensional electricfield probe and an optical wavelength demodulator, wherein the broadband laser source is sequentially connected with the optical fiber coupler, the integrated waveguide three-dimensional electric field probe and the wavelength demodulator through the single-mode optical fiber, and the integrated optical waveguide three-dimensional electric field sensing probe is formed by adhering and fixing an integrated optical waveguide two-dimensional electric field probe and an integrated optical waveguide one-dimensional electric field probe together. The integrated optical waveguide three-dimensional electric field sensor provided by the invention is composed of one single-chip integrated optical waveguide two-dimensional electric field sensor and one single-chip integrated optical waveguide one-dimensional electric field sensor, can realize three-dimensional detection for a space electric field and has the advantages of small size, high space resolution and the like.