The invention discloses a shear box applicable to a vertical ring-shear test. The shear box comprises a bottom plate, an outer cover and a top lid, wherein the bottom plate comprises an outer bottom plate and an inner bottom plate which are glidingly mounted together, the inner bottom plate is fixed, the outer bottom plate can annularly rotate, soil sample fixing blades are arranged on the inner bottom plate, shear plates are arranged on the outer bottom plate, the outer bottom plate and the lower end of the outer cover are fixed together, vertical guide rails are arranged in the outer cover,and the vertical guide rails and the shear plates are staggered in position; the top lid comprises an outer top lid and an inner top lid which are glidingly mounted together, vertical guide slots matched with the vertical guide rails are formed in the outer wall of the outer top lid, and shear plate grooves matched with the shear plates are formed in the bottom of the outer top lid. The shearing process of a rock-soil body under the vertical ring-shear action can be realized, shear displacement and uniform distribution of shear stress at the shearing surface are guaranteed, two functions of sample preparation and testing can be considered, shearing force is provided through a stepless speed changing motor, and the testing accuracy is improved.