The invention discloses an improved dynamic shear rheometer parallel-plate and a test method thereof. The improved dynamic shear rheometer parallel-plate comprises an upper parallel-plate and a lowerparallel-plate, the upper parallel-plate comprises a bottom platform and a first handle, the lower parallel-plate comprises a second handle, a top platform, a boss, and a sleeve;the lower surface of the top platform is fixedly connected with the second handle, and the upper surface of the top platform is fixedly connected with the boss; the edge of the periphery of the upper surface of the top platform is detachably connected with the upright sleeve; the bottom platform is correspondingly arranged on the top of the boss, and the upper surface of the bottom platform is fixedly connected with the first handle; a to-be-tested sample is placed between the boss and the bottom platform; and the first handle and the second handle are both in erection joint witha dynamic shear rheometer. Accordingto the improved dynamic shear rheometer parallel-plate, the rheological properties ofasphalt or mortar can be quantitatively tested when the surface of a real mineral material is in a contact state under the condition of water, and thusquantitative evaluation of water damage resistance of different types of asphalt or mortar based on an asphalt shear rheometer is possible.