Continuous zoom lens for laser additive manufacturing and laser cladding optical system

The invention relates to a continuous zoom lens for laser additive manufacturing and a laser cladding optical system. The problems that energy distribution in light spots is seriously uneven, the light spot quality is degraded, and the cladding efficiency and quality are affected by adopting a method for increasing the size of the light spots through defocusing are solved. Comprising a continuous zooming collimation group and a convergence lens group. The continuous zooming collimation group comprises a positive-focal-power meniscus lens, a third positive-focal-power biconvex lens, a negative-focal-power biconcave lens and a first positive-focal-power biconvex lens which are sequentially arranged in the laser emitting direction; the positions of the positive-focal-power meniscus lens and the first positive-focal-power biconvex lens are fixed, and the third positive-focal-power biconvex lens and the negative-focal-power biconcave lens can axially move along an optical axis; the emergent surface of the positive