The invention relates to a harrowing machine for cesspool. An upper portion is provided with a power mechanism frame, a harrowing mechanism is arranged in the frame, and the power mechanism is connected with the harrowing mechanism through a transmission mechanism; and the harrowing mechanism comprises a rotating shaft transversely arranged at the inner side of the frame, the rotating shaft is provided with a plurality of cutting disc groups, each of the cutting disc groups comprises a plurality of cutting discs, the cutting direction of the cutting discs is vertical to the rotating shaft, the frame is also provided with grating bars, and the grating bars and the cutting disc groups are arranged in a parallel and interlace manner. The machine simultaneously has nearby sewage raking, sewage stirring and large particle-in-sewage cutting functions, and guarantees no coagulation or floatation induced by long-time standing, and dirt is always uniformly distributed and is processed to form small external diameter structures, so the dirt can conveniently pass through a conveying pipeline and does not obstruct the conveying pipeline, the first level treatment efficiency is greatly improved, and good physical pretreatment is provided for implementation of second level treatment, thereby sewage treatment hardware facilities have long service life, and the sewage treatment efficiency and the sewage treatment effect are guaranteed.