Multi-wavelength erbium-doped fiber laser using two polarization-maintaining fiber Bragg gratings (PMFBGs) in the symmetrical linear cavities at room temperature is proposed. Due to the polarization hole burning (PHB) enhanced by the PMFBG and the symmetrical cavities structure, stable four-wavelength lasing emission can be generated by adjusting the polarization controllers (PCs) simply. The side mode suppression ratio (SMSR) is over 50 dB. The amplitude variation with 16 times scan in nearly one and a half hours is less than 0.8 dB.