A tunable multiwavelength Brillouin-erbium fiber laser is demonstrated. With the mirror constructed by the optical circulator and the ring-cavity, a bidirectional feedback structure is constituted to reduce the Brillouin threshold. This fiber laser provides a tuning range of 65 nm from 1513 nm to 1578 nm. At the Brillouin pump power of 15 dBm (32 mW) and the 980 nm pump power of 23 dBm (200 mW), 11 output channels with 0.08 nm channel spacing are achieved.