Continuously tunable Er³⁺-doped ring fiber laser with multi-intra-cavity polarization controller has been presented by using the tuning mechanism of polarization controlling. The CW lasing with 22 nm(1538～1560 nm) tunable range,0.1 nm spectral line-width,45 dB optical signal-to-ASE-noise ratio have been achieved. When the laser is pumped by different pump power from 10 to 50 mW,the fluctuation of peak power is less than 1dB during the whole tuning range at different center wavelength. The laser also exhibits a very good operating stability with spectral fluctuation of less than 0.05 nm for tens of hours at room environments.