The invention belongs to the technical field of waste disposal, and particularly relates to an urban solid waste disposal system which comprises a box body, a motor, a crushing roller, a breaking module, a first vibration module, a second vibration module, a spiral feeding shaft, a spiral extrusion roller and a filter net; the crushing roller is rotatably installed on the upper portion of the interior of the box body; the breaking module comprises a driving shaft, a rotary disc, a guide column, a rack, a first inclined block, a fixing rod, a breaking cutter shaft, a driving gear, and breakingcutters; and the driving shaft is transmitted with the crushing roller through gear engagement, the rotary disc is fixedly connected to one end of the driving shaft, the outer circle of the rotary disc is fixedly connected with the guide column, the guide column is used for squeezing the first inclined block arranged on the end head of the rack, the middle of the breaking cutter shaft is fixedly connected with the driving gear, the driving gear is engaged with the rack, and the two ends of the breaking cutter shaft are correspondingly provided with the breaking cutters. According to the urbansolid waste disposal system, power of the breaking roller by the rack and the driving gear, a power source drive is used for achieving multi-stage breaking of solid waste, the breaking efficiency is improved, and energy can be saved.