Based on the birefringence effect, a novel polarization splitter based on dual elliptical-core photonic crystal fiber (PCF) is proposed, the elliptical-core through introducing a pair of big air holes and a pair of small air holes in every core. The full-vector finite element method (FEM) and the semi-vector beam propagation method (BPM) are employed to analyze the performance of the splitter. Numerical simulations demonstrate that it is possible to obtain a 544 μm long polarization splitter, and the polarized light extinction ratio is -43.75 dB at the wavelength of 1.55 μm. Besides, the bandwith is over 80 nm when the extinction ratio is less than -10 dB. Such design provides a new approach to get highly extinction ratio and short length polarization splitter based on dual-core photonic crystal fiber.