The direct driveing of the front forcible feeder prevents the slippage of the conveyor during heavy load. The attachment of brush and retainer rod as soil remover will kick off the soil which attaches to the plant. It uses the crosswise picking device to stand for the original parallel one, which will avoid the result of the dead zone by the old one. It will enlarge the range of the most favorable plant height for harvesting also. It will screen off the soil during the process, if use the grid conveyor for the sorting and collecting device. According to the modification describes before, the harvesting speed and processing capacity will meet. The harvesting speed will up to 0.5m/s, it is 2.5 times faster than the old one.