The invention relates to a crocodile belly skin tanning processing method. The problems that fats are difficult to remove, dermatome and oracle bone are difficult to soften, scales and shells are difficult to remove, bleaching and fading effects are not good, the finished leather is flat, thin, empty and loose, and the hang drying method is improper and the like are unsolved in the existing crocodile skin tanning technology. The crocodile belly skin tanning processing method comprises the steps of soaking, fleshing, oil film scraping, degreasing and pre-liming, oil film scraping, aldehyde pre-tanning, oil film scraping, liming, oil film scraping, scale brushing, deliming, oil film scraping, united bleaching, softening, oil film scraping, combined bleaching, degreasing, oracle bond softening and bleaching, pickling and softening, tanning, shaving, degreasing, neutralizing, re-tanning, fat-liquoring, leather fluffing, dry cleaning, dyeing, hang drying and coating. The processing technology of Nile crocodile belly raw material skin is provided, and the crocodile skin is soft and plump and elastic, keeps the complete crocodile skin patterns, not only can be processed into dark leather, but also can be processed into light leather and white leather. The leather can be used for processing luggage leather, shoe leather, belt and watch strap leather and the like, and has a very high market value.