A hydrogel reservoir electroencephalogram electrode. The hydrogel reservoir electroencephalogram electrode comprises a reservoir tank (10) configured to store an electrolyte and a cover body (20) configured to bear hydrogel (30). The reservoir tank (10) is detachably connected to the cover body (20); the hydrogel (30) is fixed to an inner cavity of the cover body (20); the hydrogel (30) extends out of the cover bottom surface of the cover body (20), and a silver/silver chloride electrode (40) is embedded in the hydrogel (30); a cavity for storing the electrolyte in the reservoir tank (10) is communicated with the inner cavity of the cover body (20), and it is configured that the electrolyte penetrates into the hydrogel (30) from the cavity; a wire (50) extends out of the end of the reservoir tank (10) distant from the cover body (20) and is configured to output a detected electroencephalogram signal.
HYDROGEL RESERVOIR ELECTROENCEPHALOGRAM ELECTRODE