The present invention relates to an additive product suitable for coal-fired boilers of electric power, thermal power, petroleum, chemical and metallurgical industries, and particularly relates to a chromium-based boiler slag-removing ash-removal coal-saving composition, and the chromium-based boiler slag-removing ash-removal coal-saving composition consists of the following components in parts by weight: 50 to 65 parts of chromium oxide, 8 to 15 parts of copper oxide, 5 to 9 parts of cerium oxide, 5 to 9 parts of barium molybdate, 7 to 14 parts of cobaltous oxide, 12 to 17 parts of potassium permanganate, 10 to 16 parts of manganese carbonate, 12 to 17 parts of barium carbonate, 8 to 15 parts of titanium dioxide, zinc oxide, 15 to 20 parts of zinc oxide, 6 to 10 parts of potassium chlorate, 6 to 10 parts of potassium perchlorate, 20 to 28 parts of sodium carbonate, 25 to 35 parts of active attapulgite carclazyte and 0.1 to 0.3 part of alkyl glycerol ether sulfonate. The chromium-based boiler slag-removing ash-removal coal-saving composition is an environmentally-friendly product which is efficient in combustion helping, and high in coal saving ratio, can reduce pollution, improve combustion efficiency, and extend the boiler service life, and is convenient to use and stable in performance, and when in use, only the chromium-based boiler slag-removing ash-removal coal-saving composition is added into a fuel to participate in the combustion without equipment transformation.