Abstract: In order to better treat high-concentration refractory organic wastewater, the optimum conditions and treatment effect for treating wastewater from Tobias acid production were studied in a batch-type supercritical water oxidation (SCWO) device by SCWO technology. Through single factor and orthogonal tests, the removal rates of COD and chrominance were investigated under different experimental conditions. When the temperature is 380℃, the pressure is 24 MPa, the residence time is 150 s and the excess oxygen rate is 1. 8, the removal rates of COD and chrominance reaches 96. 7% and 97. 5%, respectively, and the biodegradability of the wastewater is improved greatly.