The invention discloses a high-quality mulberry silk processing method which comprises the following steps: (1) high-temperature and high-pressure treatment on mulberry silk; (2) degumming treatment; (3) cooking; (4) soaking; (5) low-temperature treatment; (6) warming-up treatment; (7) drying treatment. According to the method disclosed by the invention, the mulberry silk is subjected to special processing treatment, so that the flexibility of the mulberry silk is effectively improved, and the strength of the mulberry silk is guaranteed. Moreover, the gas permeability, temperature resistance and the like of the mulberry silk are improved, the overall characteristics are excellent, and the application value is high.