The invention provides a method for measuring the organic carbon content in the sodium aluminate serosity, relating to the method for measuring the organic carbon content in the sodium aluminate serosity in the process flow of manufacturing aluminium oxide by an ore dressing-Bayer process. The method is characterized in that the test procedures comprises the following steps in sequence: (1) adding sodium aluminate serosity samples to a porcelain boat, adopting a combustion method, taking an acid-washed asbestos as a slipcover, firstly, drying for 30 to 50 minutes at the low temperature, gradually heating up to 900 DEG C, firing for two minutes in the presence of oxygen, absorbing the generated CO2 with potassium hydroxide, and measuring the full carbon contents in the materials with a gas volumetric method; (2) adopting acid base titration to measure the inorganic carbon contents in the measuring sample; and (3) adopting a subtraction method to measure the organic carbon content in the sample. In the method of the invention, appropriate reaction conditions are selected for the materials in the process; the full carbon and inorganic carbon content in the materials are measured in sequence by the gas volumetric method and the acid base titration; the organic carbon content is measured by the subtraction method. The method is simple and effective.