The invention relates to non-sulfur anti-browning sweet potato slices and a processing method thereof. The method comprises the steps of peeling, slice cutting, rinsing, non-sulfur anti-browning, steam pre-cooking, solar-assisted heat pump combined drying, cooling, seasoning and packing. According to the making method, by means of a non-sulfur anti-browning agent, the surface color of dried sweet potatoes can be good, and the effect of inhibiting enzymatic and non-enzymatic browning can be achieved; meanwhile, a solar-assisted heat pump combined drying technology is utilized for producing the dried sweet potatoes, the flavor, color and relevant quality of dried products can be maintained to the maximum extent, the made dried sweet potatoes are bright in color and attractive in appearance, the nutritional ingredient are well maintained, and enhancement of the market competitiveness of dried sweet potato products is promoted.