Disclosed is a multi-shaft pressurized rock mechanics tester, pertaining to the technical field of rock mechanics testing devices, comprising a base; the base is of an integral rectangular structure, and welded six vertical support plates symmetrically at the front and back ends, a -shaped bracket plate is horizontally welded at the top of the six vertical support plates (“” is a Chinese character, read as “Ri”), and a bracket plate is rotatably installed on the top section of the three rear vertical support plates, pressed against the -shaped bracket plate; the left and right sides of the base are symmetrically welded with four vertical bracing plates, an I-shaped installation plate is welded on the top of the four vertical bracing plates, four hydraulic cylinders are locked, fixed and hoisted on the bottom of the I-shaped installation plate with screws.