The invention relates to an optical fiber array amplifier for improving signal intensity of an imaging system or a communication system, and belongs to the field of a laser technology and optical fiber optics. The optical fiber array amplifier mainly comprises a coupling lens, a dichroscope, an optical fiber array, a pumping source, a light filter and a light detector. In the optical fiber array amplifier, the optical fiber array doped with a rare earth element is taken as a gain medium and a two-dimension arrangement shape of the optical fiber is designed so as to improve signal light; and the optical fiber array doped with the rare earth element is taken as the gain medium of the amplifier, a light signal amplification scheme is achieved, the high-intensity and high-stability signal output of an array signal is achieved, and the optical fiber array amplifier has the characteristics of high resolution and high power.