The invention discloses a preparation method for a physical radiation-proof and sun-screen cosmetic for dry skin. The preparation method comprises the following steps of: (1), preparing raw materials; (2), preparing vaseline liquid; (3), preparing mixed liquor I; (4), preparing mixed liquor II; (5), preparing a mixture; and (6) preparing the finished product. The invention also discloses the physical radiation-proof and sun-screen cosmetic for the dry skin. When the cosmetic is prepared, barium sulfate, zinc oxide and silver are added, so that the cosmetic has good physical radiation-proof and sun-screen effects. The preparation method is simple and reasonable, high in production efficiency and low in cost; the cosmetic prepared by the method is high in stability and safety, and can quickly infiltrate into skin and form a protective film on the surface of the skin, so that harm of ultraviolet rays to the skin is effectively avoided; and meanwhile, the cosmetic can reflect or absorb and convert the radiation of products such as a computer, and has the multiple effects of effective supplementing water, moistening and moisturizing, balancing grease, shrinking pores, resisting the aging of the skin and the like.