Abstract: With economic development and the improvement of science and technology, such construction machinery as rock tunnel boring machines, shield machines, raise boring machines, and road headers have been applied unprecedentedly to underground works. Therefore, the testing of mechanical rock breaking has become an indispensable experimental means for construction machines used in underground works and can also guide the design and operation of those machines. This paper introduces a new mechanical rock-breaking testing platform developed by Beijing University of Technology that is designed and manufactured by considering such factors as the influence of high ground stress, cutterhead rotation and rock breaking by multiple cutters at the same time. Meanwhile, other cases such as different rock-breaking tools for different excavation machines and different rock mass structures in a sample box are taken into account, which makes for a realistic simulation of construction conditions onsite for different cutting tools. The testing platform consists of a mechanical system, hydraulic system, automatic control system and data acquisition system. The completed platform has been used for several tests under different cases, and test results proved that this platform meets its design requirements.