Abstract: In the course of power grid construction and transformation, with the increasingly prominent environmental problems, it is very important to do well the work of soil and water conservation.In order to improve the monitoring accuracy and realize the automatic monitoring of soil and water conservation, this paper, based on the soil and water conservation monitoring system of the original power transmission and transformation project, uses the photosensitive measuring drill technology to replace the original measuring drill technology to realize the power self-supply and improve the stability, reliability and accuracy.In this paper, shaanxi-hubei ultra high voltage direct current transmission project as an example, the use of photosensitive measurement of soil erosion, the results show that the stability and accuracy of the equipment is good, can meet the needs of transmission engineering soil and water conservation monitoring.