The invention relates to a sulphate trivalent chromium electroplating pollution which comprises conductive salt, a preparation A, a preparation B, a preparation C, a preparation D, a wetting agent andpure water. At the normal temperature of 25-40 DEG C, an electroplated workpiece can be adopted to obtain a trivalent chromium coating with good appearance, and the thickness of the coating can be 1micron or more; the electroplated workpiece is strengthened in corrosion resistance, hardness, electrical conductivity, smoothness, heat resistance and wear resistance; a deposition rate of a chromiumlayer is 0.1-0.2 micron per minute; and electric energy can be saved, and use cost can be reduced in case of guaranteeing process quality. The Lab colour of the coating can be freely regulated withina range of L being greater than 65 and smaller than 80, a being greater than (-)1 and smaller than 1, and b being greater than 2 and smaller than 6, so that the colour of the coating can be regulatedto be brownish black from sliver, and the coating has the advantages of being good in stability, strong in covering power, good in uniform-coating ability and environmentally friendly.