Provided is a method for measuring expansion cement slurry expansion pressure stress. The method comprises the following steps that 1, hole drilling is conducted; 2, expansion cement slurry is prepared; 3, grouting is conducted; 4, multiple pressure sensor sets are equidistantly arranged on the portions, in different depths from portholes, in all cylindrical holes; 6, the multiple pressure sensor sets are connected with a pressure collection system, and pressure data at different times after the expansion cement slurry is grouted is collected; 7, an image that the expansion cement slurry pressure stress of expanding agents with different mass content changes with the time is drawn according to the pressure data collected in the sixth step, and expansion pressure stress stable value and limit value are obtained, that is to say, the expansion cement slurry expansion pressure stress is measured. According to the method for measuring the expansion cement slurry expansion pressure stress, the problem that the expansion cement slurry expansion pressure stress in not measured can be solved, the expansion pressure stress of the expanding agents with different content can be measured, a basis can be provided for a rock mass numerical simulation parameter valuation, and the measuring result is accurate.