The invention discloses a field smart operation and maintenance system for an electric power system. The system includes hierarchy classification and sorting of data, standardization and characteristic extraction of state detection data, norm establishment between an instrument and a smart operation check box, communication norm establishment between the smart operation check box and a center side, wireless real time transmission of video data streams, high magnification video compression, establishment of a high-efficiency multi-stage state detection data comprehensive indexing model and customized display of state detection data analysis diagnosis technique. According to the invention, field operation standardization and data standardization can be realized, data and analysis algorithm share between a field side and the center side can be realized, the data analysis capability of the field side is improved, and remote control and real time technique support capability of field operation and maintenance are enhanced. Therefore, professionalization and smart level of field operation and maintenance are improved, operation check working efficiency and equipment state control capability are improved, and state maintenance and auxiliary decisions are enhanced.