The utility model provides a split type screening plant of large -scale ball mill, includes U -shaped spare in quill shaft, ejection of compact bush, spiral muscle, the discharging screen frame, sieve, discharging screen frame, layering, double -screw bolt, and the quill shaft is installed in ball mill discharge end one side, and discharging screen put up high -strength bolt and was connected with ejection of compact bush, and the layering is fixed the sieve on the discharging screen frame through the double -screw bolt of taking certainly, and discharging screen frame inside spin muscle passes through the bolt to be fixed with the interior U -shaped spare of discharging screen frame, detachable spiral muscle, sieve, layering material for pure abrasive rubber or take metal framework rubber, spiral muscle, sieve, layering design for a plurality of, the design of sieve gap is 6 -12mm. The utility model discloses an adopting the abrasive rubber material or taking metal framework rubber, increase of service life reduces and changes the number of times, and it is nimble convenient to change, and the dismouting maintenance is easy, saves the change time, reduces the equipment input cost, reduces intensity of labour, improves the mill rate of utilization, is applied to in mine equipment technical field.