Compact pressing and pulling conversion force application device

The utility model discloses a compact compression-pull conversion force application device, which comprises a supporting piece and a force application piece which are matched with each other, and the supporting piece is used for hoisting a test piece so that the bottom of the test piece is higher than the ground. The stress application piece is movably sleeved with the supporting piece and can move up and down relative to the supporting piece under the action of external force, and the stress application piece is used for converting pressure borne by the stress application piece into tensile force on the test piece; the stress application piece comprises a stress application piece upper flange, a stress application piece lower flange and a plurality of force transmission columns connected between the stress application piece upper flange and the stress application piece lower flange, the stress application piece upper flange is used for bearing external pressure, and the top of the stress application piece lo