The invention relates to a chromium plating process for small shaft parts. The process comprises the following steps: (1) uniformly mixing small shaft parts with a chromium plating agent in proportion and then filling a chromium plating tank with the obtained mixture; (2) sealing the chromium plating tank, then placing the chromium plating tank into an electric furnace and sealing the door of the electric furnace; (3) carrying out segmented heating and insulation; (5) carrying out chromium plating; (5) carrying out cooling; (6) opening the chromium plating tank, pouring out the mixture in the tank, sorting out the small shaft parts and carrying out sieving to thoroughly remove the chromium plating agent; and (7) carrying out hardening and tempering. The special chromium plating agent used in the invention is prepared from alumina, ferrochrome powder and ammonium chloride according to a weight ratio of 55%: 42%: 3%. The chromium plating process has the advantages that simple equipment is used, so investment for the equipment is small; small damage is posed to the equipment, so the service life of the equipment is prolonged accordingly; coarsening of a gold substrate can be prevented, the chromium-plated small shafts have bend ductility of an angle of 45 degrees and cannot be broken off at the angle; and uniformity of chromium plating layers among the parts can be ensured, and the wear resistant and corrosion resistance of the small shafts are greatly improved.