The invention relates to a compression shear testing machine. The testing machine comprises a device frame, a shearing plate, a vertical loading mechanism used for applying a vertical loading force tothe shearing plate, and a shearing loading mechanism used for applying a horizontal loading force to the shearing plate; the device frame is connected with a swing rod device through a hinged structure with a hinged shaft extending in a front-back direction; the swing rod device is provided with a swing rod shearing surface which is opposite to the shearing plate; the radius of the hinged shaft is smaller than the vertical distance between the axis of the hinged shaft and the swing rod shearing surface; a support placing space used for placing a corresponding rubber support is formed betweenthe swing rod shearing surface and the shearing plate; and a force measuring sensor arranged in a left-right direction is arranged between the swing rod device and the device frame. The compression shear testing machine is capable of measuring the shearing force on the single rubber support.