This paper proposes a dual-core D-type high-sensitivity SPR-PCF sensor, which uses the surface plasmon resonance (SPR) technology to measure the change of the resonance wavelength by the core loss spectrum to achieve the purpose of measuring different refractive indices of the substance to be measured. By changing the arrangement of the internal air holes, it achieves the effect of dual core transmission, and the D-type structure is beneficial to speed up the surface plasmon reaction. Its working wavelength range can be adjusted, and its structure is simple and easy to measure and operate. The experimental results show that the refractive index measurement interval is 1.35-1.40.The maximum spectral sensitivity is 15 000 nm/RIU, maximum amplitude sensitivity is 582.12 RIU-1, and the refractive index accuracy of the probe is 1.56×10-5 RIU.