The invention belongs to the technical field of electric power detection and provides a photoelectric AC / DC voltage transducer based on the Pockels effect. The photoelectric AC / DC voltage transducer is not affected by environment temperature change, measurement precision is high, signal transmission is convenient, safety performance is high, power supply is not needed at a measurement point, and optical fiber signal transmission is immune to electromagnetic interference. The photoelectric AC / DC voltage transducer comprises a laser source, a transducer component, transmission fiber, a photoelectric detector and a backward-stage signal processing system, wherein the transducer component comprises a laser collimator I, a polarizer, a 1 / 4 wave plate, a crystal, an analyzer and a laser collimator II which are arranged along an optical path in sequence, the crystal is a cuboid, the length direction of the crystal is the light passing direction, the upper surface and the lower surface, perpendicular to the light passing direction, of the crystal are plated with metal layers serving as detection electrodes, the metal layers are used for loading voltage to be measured, the voltage direction is perpendicular to the light passing direction, and the backward-stage signal processing system obtains the voltage to be measured through a signal output by the photoelectric detector.