The invention relates to the field of testing equipment of rock mechanics and provides a rock shear test system. According to the rock shear test system, the problems that the internal deformation mechanism and structural evolution of rocks in the shear breakage process cannot be known in the prior art are solved. The rock shear test system comprises a loading device and a driving device, whereinthe loading device comprises a loading bin which is configured to apply a shear force to a rock test piece; and the driving device is connected with the loading bin and is used for driving the loadingdevice to drive the rock test piece to rotate. According to the rock shear test system, the functions of a rock shear test machine are realized, the internal deformation mechanism and structural evolution of the rocks in the shear breakage process can be acquired through lossless CT scanning, the rock shear breakage process can be dynamically observed, and the reference basis is provided for solving the rock engineering problems in construction projects of hydraulic engineering and buildings.