The invention relates to a surface plasma resonance-based optical fiber multipoint micro displacement sensing method and device. The surface plasma resonance-based optical fiber multipoint micro displacement sensing device is characterized by comprising a broadband light source, a polarizer, two single-mode transmission optical fibers, a single-mode sensing optical fiber, multiple displacement probes, multiple sensitive areas and a spectrometer, wherein the sensitive areas are multiple areas obtained through corroding the sensing optical fiber; the displacement probes are single-mode optical fibers of which the end face is cut flat and golden films with different thicknesses are plated; an air chamber is an air gap between the displacement probes and the sensitive areas; an evanescent field is formed in the sensitive areas through the sensing optical fiber by light, the plasma resonance effect is generated on the surface of the golden films of the displacement probes; the absorption peak intensity of the resonant wavelength is determined by the length of the air chamber; the golden films with different thicknesses generate different resonant wavelengths, and multi-displacement measurement can be realized through the wavelength demodulation. According to the surface plasma resonance-based optical fiber multipoint micro displacement sensing method and device, disclosed by the invention, the structure is simple, the volume is small, the sensitivity is high and reuse can be realized.