The invention relates to a method for measuring deformation modulus values of rock masses at different depths. The method utilizes a light device easy to assemble on site, can carry out measurement in most engineering environments and especially in underground construction, realizes simultaneous measurement of deformation modulus values of rock masses at different depths and prevents influence caused by cracks, a fault fracture zone and a weak interlayer on the measurement result. The method comprises (1) arranging a deformation modulus measuring point, (2) arranging a measuring hole at the selected measuring point, (3) grinding and cleaning the pressure-bearing surfaces of the measuring hole, (4), arranging a loading device in the measuring hole, (5), drilling the two pressure-bearing surfaces of the measuring hole to obtain drill holes, carrying out cleaning and putting multi-point displacement meters into the drill holes, and (6), controlling oil pump output pressure through an oil pump switch connected to the oil pump, and transmitting pressure to a pressing plate through a jack so that the pressure acts surrounding rock masses. The method is suitable for the field of rock engineering.