A continuous wave laser based on Nd-doped double-clad large-mode-area polarization-maintaining photonic crystal fiber (PCF) is realized at 1.06 μm. A linear-cavity is employed, and one end face of the fiber is polished to 0° providing 4% feedback serve as a cavity mirror and a free output coupler. The slope efficiency obtained is 18.8% with a threshold pump power of 2.4 W. The maximum output power is 4.94 W and the beam quality factor is 1.30, when the pump power is 30 W. The measured central wavelength is 1062.7 nm and the polarized crosstalk factor is -7.9 dB. Experimental results show that the Nd-doped double-clad large-mode-area PCF has well single mode propagation and polarization-maintaining characteristics, and is beneficial to achieve high power laser output with high beam quality.