Closed tearing pulping system

The invention discloses a closed tearing pulping system, which comprises a double-screw extruding and tearing machine, the double-screw extruding and tearing machine comprises a compressor shell and a sealing shell, a first screw and a second screw are arranged in the compressor shell, and spiral blades are arranged on the peripheries of the first screw and the second screw. The first screw and the second screw extend into the sealing machine shell, the first screw and the second screw are parallel to each other and meshed with each other, a feeding port is formed in the upper end, away from the sealing machine shell, of the compressor shell, a discharging port is formed in the lower end of the sealing machine shell, and the discharging port is connected with a high-concentration pulping system in a sealed mode. According to the closed tearing pulping system, material overflow and raw material waste can be avoided, waste steam generated by extrusion and tearing does not need to be discharged, the workshop env