The invention discloses a method for extracting a vitamin C from shine skin papayas. The method comprises the following steps: (1) picking fresh shine skin papayas, cleaning the picked shine skin papayas, separately cutting the cleaned shine skin papayas in an extraction protective solvent, and deseeding the cut shine skin papayas; (2) adding the flesh of the cut shine skin papayas and the extraction protective solvent in a vacuum pulping machine together, and pulping the flesh of the cut shine skin papayas and the extraction protective solvent to obtain a sizing agent ; (3) adding the generated sizing agent after pulping to a vacuum mixer to perform vacuum mixing; (4) filtering the materials obtained in the step (3) to obtain a filtrate, standing the filtrate for layering, and performing separation to obtain an organic phase; (5) adding water of which the pH is smaller than 7 to the organic phase obtained in the step (4), and performing vacuum mixing for more than 2 hours; (6) standing a mixture for layering, and performing separation to obtain an aqueous phase; (7) performing vacuum concentration on the aqueous phase to enable the aqueous phase to be dried, and performing freeze drying so as to obtain the vitamin C crude product. The extraction method disclosed by the invention can extract the vitamin C in the shine skin papayas, the extraction method is simple, and the method is suitable for large-scale popularization and application. Extracts are high in the content of the vitamin C.