Disclosed is a laser array beam combiner. A laser array emits a laser beam bundle that is incident on and transmits through a fast-axis collimator to form a one-dimensional quasi-parallel beam bundle A. The first quasi-parallel beam bundle is then incident on and transmits through the cylindrical lens to form a two-dimensional quasi-parallel beam bundle B. The quasi-parallel beam bundle B is then incident on and transmits through the dispersion unit and returns along the original path to the cylindrical lens, and then transmits through the cylindrical lens to be focused onto a common image point. Thus, the wavelengths of various light emitting spots of the laser array can be locked and the individual array beams can be automatically synthesized as a single-point beam bundle, improving the brightness of the laser array.