▎ 摘　　要

NOVELTY - The wall electrode has a hollow structure of a graphene wall micro-tube, whose one end is tightly inserted in the graphene wall micro-tube, and the other end passes through the graphene wall micro-tube tantalum wire. The diameter of the tantalum wire is 0.5-0.7 mm, the length of the tantalum wire is 18-20 cm, the outer diameter of the graphene-walled microtube is 1.2-1.5 mm, and the length of the graphene-walled microtube is 5-8 cm. USE - Self-supporting graphene wall electrode used for collecting electroencephalogram signals (claimed). ADVANTAGE - The electrode is easy to prepare high density electrode, and collects multi-channel brain electric signal in smaller scalp area. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) an electroencephalogram signal measuring device based on the self-supporting graphene wall electrode; and (2) a test method of the electroencephalogram signal measuring device. DESCRIPTION OF DRAWING(S) - The drawing shows a waveform diagram illustrating the electrooculogram signal.