The utility model belongs to a cold tandem mill unit equipment, in particular to a double-layer hydraulic pressure shear, which comprises a frame, a hydraulic pressure cylinder, a pinch roll, and a shear edge, which is characterized in that: a fixed pinch roll driven by the cylinder composed of a cylinder, a bracket and a connecting bar to lift and descend is respectively arranged at each layer of the frame corresponding to the positions of the movable pinch roll at the entrance of the upper and lower layer passages and the movable pinch roll at the exit of the upper and lower layer passages, the movable shear edge driven by the hydraulic pressure cylinder composed of a hydraulic pressure cylinder, a main connecting bar and a four-bar mechanism is symmetrically arranged between the two fixed pinch rolls at each layer of the frame and is corresponding to the positions of the two movable shear edges, a fixed shear edge is arranged between the two movable shear edges on the frame. The double-layer hydraulic pressure shear has the advantages of rational design, compact structure, convenient control, sufficient space utilization, small space occupancy, reliable performance, safe operation, and very convenient use.