The invention relates to the field of glass detection and discloses a method for measuring content of phosphorus in glass. The method comprises the following steps: (1) preparing glass powder from a glass sample to be measured; (2) mixing the glass powder obtained in the Step (1) and sodium carbonate, and heating the mixture to be melted; (3) cooling the melt obtained in the Step (2), mixing the cooled melt and hydrochloric acid to obtain a clear solution; (4) using water for constant volume of the clear solution obtained in the Step (3), and measuring content of phosphorus in the constant-volume solution; and (5) determining content of phosphorus in the glass to be measured according to the volume of the constant-volume solution and the measured phosphorus content. The method for measuring content of phosphorus in glass is accurate, reliable and stable, is simple to operate, has little harm, and is fast for analysis.