A new kind of dual-core photonic crystal fiber (PCF) polarization splitter based on tellurite glass is designed. The full vector finite element method, coupled-mode theory and the full vector beam propagating method are emplyed to investigate the characteristics of the polarization splitter, meanwhile the quartz glass dual-core PCF polarization splitter with the same structural parameters is applied to compare. Numerical investigations demonstrate that the designed polarization splitter has higher extinction ratio and lower coupling loss. The two polarized lights are separated entirely with 441 μm fiber at the wavelength of 1.55 μm and the extinction ratios in x and y polarization directions are -50.1 dB and -53.6 dB, respectively. When the extinction ratio is less than -20 dB, the bandwidths are 34 nm and 36 nm respectively, and the coupling loss is only 0.0009 dB.