The invention discloses a paper machine broken paper processing pool comprising a broken paper pool, a pulper, a clean water injection tube and flow pulp pipelines. The paper machine broken paper processing pool is characterized in that a bottom opening (a) is formed on the side wall of the bottom of the broken paper pool; at least one pulper is provided; the flow pulp pipeline have a pulp inlet pipe, a pulp pumping pipe, a return pipe and a pulp discharging pipe; a starting end of the pulp inlet pipe is communicated with the bottom opening (a) of the broken paper pool; a pulp pump is mounted between the pulp inlet pipe and the pulp pumping pipe; the pulp pumping pipe, the return pipe and the pulp discharging pipe are connected via a tee-joint; a fluid control valve is respectively arranged on the return pipe and the pulp discharging pipe; and an output end (b) of the return pipe is 10 to 100cm away from the edge of the bottom opening (a) in the broken paper pool. With the addition of the return pipe technology, a problem of pulp inlet pipe jam due to broken paper during the pulp pumping by the pulp pump can be effectively prevented, so water and electricity loss can be reduced and service life of the equipment can be prolonged.