The invention discloses a Kerr effect-based integrated electric field measuring probe, which belongs to the electrical measuring technology field. A fiber collimator, a fiber coupler, a total reflection prism and a fiber type polarizer form an integrated optical device unit. The fiber collimator and the fiber coupler are arranged inside a support of the electric field measuring probe. The electricfield measuring probe is connected with a laser source and a detection device through transmission fibers. The fiber collimator, the fiber coupler, the total reflection prism and the like inside theelectric field measuring probe are provided with bubble-free spaces filled with to-be-measured liquid dielectric. Through the integrated optical device unit, the electric field measuring probe can beplaced into the liquid dielectric to measure the intensity of an electric field online. The characteristics are that the electric field measuring probe is high in integration, high in sensitivity andsmall in size and can be introduced into the liquid dielectric to measure the intensity of an electric field online.