Abstract: Studied a method how to prepare chromium oxide green through chromium-containing waste liquid generated from the production of β-methylnaphthoquinone.First，use glucose solution to reduce the chromium-containing waste liquid of β-methylnaphthoquinone，then put it together with urea under 140 ℃，and 0.4 MPa for about 1 h to synthesize chromium hydroxide，and roast the chromium hydroxide at 1 000 ℃ to make chromium oxide green.The product′s quality，color difference，and intensity were inspected according to the Industrial Chromium Oxide HG/T 2775—2010 and Comparison of Colour of Pigments GB/T 1864—1989，respectively.Results showed the color difference and intensity of the sample were 0.27 and 98.47%，respectively.

Key words: urea hydrothermal method, chromium-containing waste liquid, chromium oxide green