Coaxial laser composite cold spraying nozzle device

The invention belongs to the field of composite additive manufacturing equipment, and particularly discloses a coaxial laser composite cold spraying nozzle device which comprises a light beam collimating mirror, a sleeve, a fixed cylinder assembly, a reflector assembly and a Laval pipe assembly which are sequentially arranged from top to bottom. The fixed cylinder assembly comprises a first fixed cylinder and a second fixed cylinder; the reflector assembly comprises a concave reflector and a conical reflector which are coaxially arranged, the concave reflector is installed in the first fixing cylinder and fixed to the lower end of the sleeve, and the conical reflector is installed at the upper end of the second fixing cylinder; when the laser composite surface strengthening device works, collimated parallel light beams are reflected twice by the conical reflector and the concave reflector to obtain shrunk annular light beams, the annular light beams heat powder sprayed out of the Laval pipe, then laser compos