Abstract:As a scientific research method, similar material simulation experiment has been widely used in the field of mining engineering to study the mechanical properties of roadway surrounding rock and roof and floor rock. However, the similar material specimens prepared by the traditional similar material specimen preparation device have problems such as uneven compaction and looseness, resulting in large dispersion of mechanical properties of the prepared specimens. In view of the above problems, this paper developed a two-way pressure equalization digital display similar material specimen preparation device, which can realize two-way pressure equalization, real-time pressure display, automatic demoulding and other functions. In order to verify the applicability and reliability of the device, the preparation and uniaxial loading test of similar material specimens were carried out. The test results show that compared with the traditional mold, the appearance of the similar material specimens prepared by the device is uniform and dense, the size is uniform, the loading surface is flat, and there is no corner missing phenomenon; he stress-strain curve of the specimen is regular, and the physical and mechanical properties are stable. The failure characteristics of the specimen are obvious, the test results are more stable and the test data are more reliable. The development of the device overcomes the shortcomings of large labor consumption and low preparation efficiency in the preparation process of the traditional device. It is of great significance to improve the preparation efficiency of similar material specimens and reduce the discreteness of experimental results.