The invention discloses a vigna unguiculata processing method which comprises the following steps: (1), airing or drying fresh vigna unguiculata at 35-60 DEG C for 5-8 h, so as to remove 65-70% of moisture, and cleaning the aired or dried fresh vigna unguiculata for standby application; 2), adding edible salt, sorghum Baijiu and green prickly ash in vigna unguiculata, uniformly mixing pickling materials and pickling for 8 h; (3), feeding picked vigna unguiculata into a jar, sealing the jar, covering the jar with a jar cover, adding water in the jar edge and fermenting for 6-18 months hermetically; (4), after fermentation, taking vigna unguiculata out of the jar, carefully selecting, cutting, blending, filling and packaging so as to obtain a finished product. The vigna unguiculata prepared through the processing method disclosed by the invention is not rotten after being stored for a long time, free of nutrient loss, rich in taste and full-flavoured. With the adoption of the method, environmental pollution is reduced, the production waste treatment cost is reduced, and meanwhile, the problem that plenty of sewage is produced in a vigna unguiculata product processing process is solved.