The invention discloses a solid powder method chromizing process and a permeating agent formula. The solid powder permeating agent formula comprises, by mass, 20%-40% of pure chromium powder, 58%-78%of aluminium sesquioxide and 1%-3% of ammonium chloride. Dry sand blasting is conducted on the chromized surface of a part through a dry sand blasting machine, the part is put into the bottom of a muffle tank after dry sand blasting, the muffle tank is heated, heat preservation and cooling are conducted, and part chromizing is completed. According to the solid powder method chromizing process andthe permeating agent formula, oxidation resistance and corrosion resistance of the workpiece are improved through the permeating agent. The surface hardness of the chromized layer prepared through thechromizing process can reach 1200-1500 HV, abrasion resistance of the workpiece is improved, the chromizing process is simple in procedure and reliable, and quality is stable.