With the continuous iterative development of integrated circuits, communication transmission, signal processing and other technologies, brain-computer connectivity oral technology has gradually penetrated into neuroscience research, neural function repair, intelligent wear, leisure and entertainment all kinds of fields. Neural electrode devices are used to realize ionic currents in biological tissues and electronic currents in electronic devices it is one of the key technologies for the research and development of brain-computer interface (BCI). This paper focuses on the non-invasive brain-computer interface (BCI), which is accepted by most users due to its non-invasive nature in order to meet the application requirements of performance, comfort and convenience, the following aspects of EEG electrode devices are proposed research work on surface: Research target: On the basis of the existing gel electrode, the size and structure of gel electrode were deeply optimized, and the gel electrode structure was developed which was more in line with the characteristics of the hair area and could better adapt to different scalps.