The invention relates to the technical field of building material test equipment, in particular to a stress loading combination device. The device is used for being placed on a loading platform of a uniaxial servo press to perform a true triaxial pressure test on a cubic test piece. The device comprises two groups of first loading components and second loading components, wherein the first loadingcomponents are arranged perpendicular to each other and are used for transmitting force in a circumferential direction of the cubic test piece, and the second loading components are used for transmitting force in an axial direction of the cubic test piece; the first loading components and the second loading components make close contact with a circumferential surface and an axial surface of the cubic test piece respectively; and a force application mechanism is connected to each first loading component, a control system is connected to each force application mechanism, and displacement measurement components are arranged on the first loading components and the second loading components respectively. Through the device, restraint stress can be precisely controlled, manufacturing cost is low, operation is easy, and the application range is wide.