Hexavalent chromium reducing agent and preparation method thereof

The invention relates to a hexavalent chromium reducing agent and a preparation method thereof, wherein the hexavalent chromium reducing agent comprises the following components in parts by weight: 10-15 parts of ferrous ions, 3-7 parts of stannous ions, 1-4 parts of tin ash, 5-10 parts of a dispersant, 8-12 parts of a stabilizer, and 45-60 parts of a solvent. According to the hexavalent chromiumreducing agent provided by the invention, stannous oxide and zero-valent tin in tin ash are extracted, so that the reducing ions interact with sodium tripolyphosphate, citrate and other dispersants and stabilizers easily dissolved in a solution so as to avoid or reduce the use of high-purity reagents, reduce the production cost and stabilize stannous ions, ferrous ions and zero-valent tin, and thezero-valent tin in the tin ash has a certain reduction effect, can be used for adjusting the pH value of the solution, inhibiting the hydrolysis reaction of the stannous ions, promoting the concentration of the stannous ions