The invention provides a two-rotor horizontal fiber-planting plate material mixing stirrer. The two-rotor horizontal fiber-planting plate material mixing stirrer comprises a rack, an stirring barrel horizontally mounted on the rack in the axial direction, two sets of bearing mechanisms respectively mounted at the barrel wall centers of the axial two ends of the stirring barrel, a rotor mounted in the stirring barrel through two sets of the bearing mechanisms and a power device mounted on the rack; the bearing mechanism comprise outer bearing seats fixedly arranged on the barrel walls at the axial two ends of the stirring barrel, outer bearings mounted in the outer bearing seats, outer rotor shaft sleeves mounted in the outer bearings and inner bearings mounted in the outer rotor shaft sleeve; the rotor comprises an inner rotor and an outer rotor coaxially rotating with the inner rotor. The two-rotor horizontal fiber-planting plate material mixing stirrer has the advantages of scientific design, low energy consumption and good stirring effect.