A screening examination system for screening and examining paper roll is disclosed to include a first conveyor unit, which comprises a first movable wheel set, a first drive wheel, a first fixed wheel and a first conveyor belt, a second conveyor unit, which comprises a second movable wheel set, a second drive wheel, a second fixed wheel and a second conveyor belt, and an examination unit, which examine test products and adjusts the relative positioning between the first movable wheel set and the second movable wheel set subject to examination result for enabling defective products to fall into the gap between the first conveyor unit and the second conveyor unit, accordingly, quality product to be delivered from the first conveyor unit to the second conveyor unit.