The invention discloses a cutting device of a polypropylene filter element framework for water filtering. The cutting device comprises an operation table, an arm beam, a saw blade, a moving plate, a bottom cabinet, a limiting block and walking wheels. The cutting device is characterized in that the operation table is arranged on a support; guide rails are arranged on the operation table; the arm beam is arranged on the operation table; a control cabinet and a stabilizer are arranged on the arm beam; steering wheels are arranged in the arm beam; control buttons are arranged on the control cabinet; a fastening block is arranged on the stabilizer; the bottom cabinet is arranged between the operation table and the support; motors and the steering wheels are arranged in the bottom cabinet; and runners are arranged on the motors. By means of the cutting device, the two motors are arranged and the runners on the two motors rotate in opposite directions, the saw blade between the runners is driven to rotate, and therefore the polypropylene filter element framework is cut; and the saw blade penetrates the stabilizer and the fastening block, and stability of the saw blade in the filter element framework rotating and cutting process is improved.