Ultraviolet phototherapy skin protective agent and preparation method thereof

The invention provides an ultraviolet phototherapy skin protective agent and a preparation method thereof, and belongs to the technical field of skin protective agents. The protective agent provided by the invention contains cuttlefish melanin; the extraction method of the cuttlefish melanin comprises the following steps: firstly, uniformly mixing double distilled water with ink of a cuttlefish ink sac, centrifuging, and collecting precipitates; adding alkaline protease into the precipitate to carry out hydrolysis reaction; and after the hydrolysis reaction is completed, heating to inactivate the protease, centrifuging and washing the enzymolysis product, and collecting the precipitate, namely the cuttlefish melanin. The protective agent provided by the invention can effectively protect normal skin from being damaged by ultraviolet rays, and meanwhile, due to the fact that the protective agent can block the damage of the ultraviolet rays to the normal skin, the diseased skin can be irradiated more intensively