Based on the nonlinear Kerr effect, the multi-wavelength chaos is generated in erbium-doped fiber ring laser (EDFRL) experimentally. Period-doubling route to chaos is observed in time series. Numerical simulation is also carried out, and the numerical results agree with the experimental results well. The experimental results show that the optical spectra of multi-wavelength chaotic fiber laser can output five different wavelengths at most with the pump power increasing, and the output of each wavelength is chaotic after a tunable fiber Bragg grating filter.