The invention relates to a method for measuring the organic matter content of an organic fertilizer and belongs to the field of organic fertilizer quality detection. According to the method, the amount of a sample is determined at first, and then detection is carried out; and therefore, the dilution and constant volume process of a potassium dichromate concentrated sulfuric acid oxidation reactionsolution are eliminated, the time of the operation of the potassium dichromate concentrated sulfuric acid solution is significantly reduced, measurement efficiency is improved, and the risk of measurement can be reduced; and a condition that re-measurement is required when a user finds that potassium dichromate is incompletely oxidized in the last step of titration in a commonly used measurementmethod can be avoided.