The invention relates to a stress loading device. The stress loading device comprises a loading cabin, a hydraulic control system and a servo oil source; the loading cabin comprises an axial horizontal rear loading cover, an annular loading frame and a front counter-force cover; a test piece platform for horizontally bearing a model is arranged on the bottom side in the annular loading cabin frame; uniformly distributed loader arrays which are used for applying stress are arranged on the left side, the right side and the upper side, opposite to the left surface, the right surface and the upper surface of the model, in the annular loading frame; uniformly distributed loader arrays are arranged in the axial direction, opposite to the rear surface of the model, of the rear loading cover; a front counter-force plate is arranged in the axial direction, opposite to the front surface of the model, of the front counter-force cover. The uniformly distributed loaders in the loading cabin are connected with the servo oil source; a displacement sensor and an oil pressure sensor are arranged in the loading cabin; the displacement sensor and the oil pressure sensor are connected with a hydraulic control system. The annular loading frame is detachably connected with the rear loading cover and the front counter-force cover in a sealed manner. The device can apply a variety of modes of stress to the models with different sizes.