Rock-soil direct shear test device

The invention discloses a rock-soil direct shear test device which comprises a foundation pit, displacement grooves are formed in the edges of the two sides of the foundation pit, a sample piece is arranged in the foundation pit, pressure plates are arranged above the sample piece and on one side face of the sample piece, and a horizontal hydraulic jack is arranged on the outer side of the pressure plate on one side face of the sample piece. A counter-force plate is arranged on the outer side of the horizontal hydraulic jack, steel plates are arranged on the two sides of the upper portion of the pressing plate located above the sample piece, a rolling row sliding belt is arranged above the steel plate on each side, the steel plates are correspondingly placed on the two sides of the upper portion of each rolling row sliding belt, and a pressure plate of a vertical hydraulic jack is connected to the upper portions of the steel plates in an attached mode. According to the device, on one hand, the eccentric pheno