An ultra-short polarization splitter based on dual-core Photonic Crystal Fiber (PCF) with a gold wire filled into the air hole between the two cores has been proposed and analyzed with the finite element method. Surface Plasmon Polaritons (SPPs) excited on the surface of gold wire have strong resonant coupling with the guided core modes of PCF, which enables a short polarization-splitting length and broadband operation. Compared to its counterparts, the proposed polarization splitter exhibits a shorter length and higher Extinction Ratio (ER), simultaneously. Numerical results indicate that the 0.263 mm long polarization splitter can achieve an ER of -70 dB at the wavelength of 1.55 μm with -20 dB-ER bandwidth of 124 nm.