The invention discloses a PVC-U honeycomb tube shell breaking device which comprises a back plate and a front plate, wherein one side of each of the back plate and the front plate is provided with a side plate; the middle upper parts of the back plate and the front plate are provided with a limiting pipeline; guide shafts are arranged between two sides of the back plate and the front plate; two outer sides of the back plate and the front plate are provided with movable plates; the outer side of each movable plate is provided with an outer side plate; a butting plate is arranged between the tops of the movable plates; the front of the butting plate is provided with a movable frame; a hydraulic cylinder is arranged at the front part of the movable frame; the lower end of a second rotating shaft is mounted at the back of the hydraulic cylinder; a piston rod is vertically arranged at the lower part of the hydraulic cylinder; the upper end of the piston rod is connected with the lower partof the hydraulic cylinder; and the lower end of the piston rod is arranged above the limiting pipeline. A PVC-U honeycomb tube on the top surface of the limiting pipeline can be conveniently subjectedto shell breaking treatment by virtue of the lower end of the piston rod, thereby greatly improving the shell breaking treatment on the PVC-U honeycomb tube.