The invention discloses a photoelectric liquid level measurement device, and belongs to the technical field of photoelectric detection. A light guide plate is used for being in face contact with or being adjacent to liquid to be subjected to liquid-level measurement, is a solid integrity, and is pervious to light, a light guide plate liquid level face and a light guide plate lighting face are arranged on the light guide plate, and the light guide plate liquid level face is used for being in face contact with or being adjacent to the liquid to be subjected to liquid-level measurement; the liquid level line of the to-be-measured liquid falls into the light guide plate liquid level face, a light guide microstructure is arranged at the light guide plate lighting face and used for guiding lighttransmitted in the light guide plate out of the light guide plate, light beams are emitted into the light guide plate from positions except the light guide plate liquid level face and the light guideplate lighting face, through the liquid level of the to-be-measured liquid, the transmission of the light beams in the light guide plate is changed, and thus a light field of emergent light of the light guide plate lighting face is changed; by detecting the change of the light field of the emergent light, the liquid level of the to-be-measured liquid is detected. The measurement device is simplein structure, components and parts are low in price, the measurement is precise and reliable, and maintenance is convenient.