The invention discloses a tunable small wavelength interval equipower dual-wavelength optical fiber laser which comprises a first optical fiber annular mirror, an optical fiber fixing and pulling support, a triangular vibration transmitter, piezoelectric ceramics, a cushion block, a radio-frequency power source, double cladding non-doped fibers, double cladding doped fibers, a wavelength division multiplexer, a pumping source, a second optical fiber annular mirror, output tail fibers, a collimating lens, a reflecting grating, a first optical power meter, a second optical power meter and an automatic frequency control circuit. The optical fiber annular mirrors, the double cladding non-doped fibers, the double cladding doped fibers and the multiplex end of the wavelength division multiplexer are sequentially connected in a welding mode, and the pumping end of the wavelength division multiplexer is connected with the pumping source in a welding mode. The signal end of the wavelength division multiplexer is connected with the second optical fiber annular mirror in a welding mode. The automatic frequency control circuit is connected with the radio-frequency power source. The tunable small wavelength interval equipower dual-wavelength optical fiber laser is of an all-fiber structure without discrete components, has no insertion loss, and has the advantages of being good in beam quality, high in output power, compact in structure, stable and reliable in performance, and capable of achieving small interval tunable dual-wavelength equipower laser output.