The invention provides a casting process of BK series brake body shell abrasion-resistant vermicular graphite iron castings and relates to the technical field of production of iron castings. The casting process includes the following steps of raw material smelting, raw material impurity removing, component analyzing, component supplementing, vermicularizing inoculation, molten iron slag removing,casting molding, cooling molding, calcination treatment, shakeout treatment and carbonitriding. According to the casting process, various chemical components are added in molten iron raw materials, sothat the made iron castings are high in strength and toughness; besides, due to the manner of carbonitriding, carbon and nitrogen are added in the surfaces of the iron castings; and due to accurate control over the pressure intensity, temperature and speed, the made iron castings are good in surface abrasion resistance and anti-fatigue performance.