A self-Q-switched and multi-wavelength mode-locked fiber laser which is based on the figure-of-eight cavity is proposed. Multi-wavelength mode-locked with the shortest pulse width of 1.6 ns and the repetition rate of 1.79 MHz are obtained when the total length of the cavity is 106.5 m. The repetition rate of the Q-switched pulse changes with the input pump power and adjustment of the polarization controllers. As we change the length of the cavity, a multi-wavelength fiber laser oscillation which operates around 1612 nm with the line space of 3.3±0.2 nm is generated. Single line, dual and triple line can be obtained by adjusting the polarization controllers.