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This invention discloses an all-fiber integrated electro-optic crystal electric field probe and demodulation device. The electro-optic crystal electric field probe includes: a polarization-maintaining fiber, a first glass sleeve, a second glass sleeve, a collimating lens, a quarter-wave plate, an electro-optic crystal, and a reflective film. The polarization-maintaining fiber is fixedly connected to the first glass sleeve, the first glass sleeve is fixedly connected to the second glass sleeve, the polarization-maintaining fiber is connected to the collimating lens, the collimating lens is connected to the quarter-wave plate, the quarter-wave plate is connected to the electro-optic crystal, and the electro-optic crystal is connected to the reflective film. The collimating lens and the quarter-wave plate are disposed inside the second glass sleeve. This invention solves the problems of unstable electric field measurement caused by the difficulty in integrating space optical elements, susceptibility to vibration, large size, and difficulty in coupling, and improves the sensitivity and stability of the measurement device.