1. One time feeding realize twice milling, fewer machines, less space and less driving power; 2. Modularized feeding mechanism allows the feeding roll to turn out for extra stock cleaning and keeping the stock from deterioration; 3. Suitable to gentle grinding of modern flour milling industry for less crushed bran, lower grinding temperature and higher flour quality; 4. Flip-open type protective cover for convenient maintenance and cleaning; 5. One motor to drive two pairs of rolls simultaneously; 6. Aspiration devices to guide air flow properly for less dust; 7. PLC and stepless speed-variable feeding technique to maintain the stock at the optimum height inside the inspection section, and assure the stock to overspread the feeding roll in continuous milling process. 8. Sensors are arranged between upper and lower rollers to prevent material blocking.