An optical system of laser dazzler is designed. The optical system is composed of a collimating system and a zoom beam expansion system, which can continuously adjust the divergence angle of the output beam of the laser dazzler. The output laser wavelength of the fiber laser is 525 nm, the numerical aperture is 0.15, and the luminous surface is 100 μm×25 μm. After being collimated by the collimating lens, and then emitted by the zoom beam expansion system, the glare distance of 100~200 m is achieved, and the static glare area of the laser is 1 m×0.24 m. The narrow edge direction of the glare surface is scanned through the galvanometer to make the laser glare area of the above glare distance reach 1 m×5 m, which is applicable to the laser glare requirements of passes and passageways. The dazzling surface produced by the optical system outgoing beam has a small fluctuation in laser power density, which can effectively maintain the dazzling effect. The total length of the optical system is 63 mm, the structure is simple, it is conducive to engineering, and the application prospect is broad.