The invention provides a D-type double-core photonic crystal fiber double-parameter plasma sensor. An optical fiber SPR sensor comprises a D-type photonic crystal optical fiber with an open annular channel and a curved side wall; a fiber core, an air hole, a metal film, a TiO2 layer, a temperature-sensitive medium, a liquid analyte and a perfect matching layer are comprised. The photonic crystal fiber is formed by arranging a fiber core of the photonic crystal fiber and air holes with the same size, a substrate material is quartz, one air hole in the middle of the fiber core is filled with a temperature-sensitive medium PDMS, and the outer ring thereof is coated with a metal film; and the metal film and the TiO2 layer are arranged on an open annular plane. The refractive index of the temperature-sensitive medium changes along with the change of the temperature, meanwhile, free electrons on the surface of a nanogold layer resonate to generate an absorption peak, the resonant wavelength of the absorption peak deviates, the temperature sensing measurement is realized by observing the deviation process of the resonant wavelength, and the surface plasmon resonance principle is adopted. The sensor is high in sensitivity, wide in detection range and high in corrosion resistance.