Geoelectric field observation serves as a crucial method in geophysical field observation. Utilizing ARM and FPGA technology, a novel geoelectric field observation instrument has been developed. This instrument incorporates multi-channel data acquisition, digital signal processing, control, and service functionalities, boasting features such as large input impedance, high measurement accuracy, and low short-circuit noise. It enables continuous and automated measurement of geoelectric field signals,catering to the requirements of earthquake monitoring and prediction research. Since 2017, the system has been extensively utilized within earthquake monitoring network of China, providing dependable observation data for earthquake prediction and scientific research.