The invention discloses a three-freedom degree dynamic compression and shear testing machine, and belongs to the technical field of instruments. The three-freedom degree dynamic compression and shear testing machine aims to solve the problems that structures are complex and work space is difficult to adjust in the prior art. The three-freedom degree dynamic compression and shear testing machine comprises a gantry frame and a working platform. The gantry frame comprises a base, stand columns and a movable cross beam, the movable cross beam is driven by hydraulic cylinders A to slide along the stand columns up and down, and the movable cross beam and the stand columns are tightened together through movable cross beam clamping mechanisms; the working platform is driven by an x-direction driving hydraulic cylinder to relatively slide on the base and is driven by two z-direction driving hydraulic cylinders to achieve z-direction linear motion and revolving motion around the y-axis, and an upper pressing plate fixed below the movable cross beam is matched with the working platform to achieve compression, shearing and turning of a test-piece. The movable cross beam is driven to continuously move by the two hydraulic cylinders A, and the three-freedom degree dynamic compression and shear testing machine is simple in structure, convenient to operate, and easy to machine and install. Because backsprings are arranged in a hydraulic cylinder B, oil pipes are reduced; due to the adoption of the lower arrangement of the two z-direction driving hydraulic cylinders, the stress state is good.