▎ 摘　　要

NOVELTY - The utility model claims a refractive index sensor based on multilateral polishing optical fiber surface plasmon resonance, comprising: an optical fibre sensing structure, a gold film, a first graphene oxide film, a first gold nano-particle layer, a second graphene oxide film and a second gold nano-particle layer; the optical fibre sensing structure comprises a plurality of polishing surfaces, the plurality of polishing surfaces are arranged along the circumferential direction of the optical fibre sensing structure, the adjacent polishing surfaces are set opposite to the plane of the axis of the optical fibre sensing structure as the symmetrical surface; the gold film, the first graphene oxide film, the first gold nano-particle layer, the second graphene oxide film and the second gold nano-particle layer are laminated in turn. The utility model solves the problem that the sensor in the prior art has low sensitivity, repeatable use is bad, and the utility model further has small volume, relatively low cost, it is very suitable for wide popularization in the sensing field.