With the double supporting structure and rubber roll is not apt to form a difference in roll end diameters, shift gears through the gearbox, keeping reasonable differential and sum of roll peripheral speeds between fast roll and slow roll; husking yield can come to 80%-90%; need not replace rubber rolls in operation, but simply exchange between rolls; use long shedding, with uniform feed, steady performance, equipped with automatic feed following mechanism, easy operation; use vertical air channel for paddy separation, with the better effect of separation, less grain content in rice hull, less rice hull contained in the mixture of husked rice and paddy.