Processing method of selenium-rich convenient instant dry asparagus

The invention relates to a processing method of selenium-rich convenient instant dry asparagus. The processing method comprises the following steps that (1) raw material cleaning: fresh selenium-rich asparagus is cleaned by water; (2) enzyme deactivation: the fresh selenium-rich asparagus is soaked for 2 to 4 minutes in water being 95 to 100 DEG C; (3) segment cutting: the cooled fresh selenium-rich asparagus is subjected to segment cutting, and the length is controlled to be 4 to 5cm; (4) flavor enhancing: the selenium-rich asparagus subjected to segment cutting is placed into prepared seasoning liquid for vacuum flavor enhancing, the vacuum degree is 0.08MPa, and the flavor enhancing time is 10 minutes; (5) freeze drying: the selenium-rich asparagus subjected to the flavor enhancing is firstly frozen for 2 hours at -35 DEG C, then, the sublimation drying is carried out for 10 hours, the unfreezing drying temperature is controlled at 40 DEG C, and the drying is carried out until the selenium-rich asparagus i