The invention discloses a washing machine inner drum and outer drum sleeving machine which comprises an outer drum conveying line, a bearing inner ring heating device, an inner drum conveying line andan inner drum loading manipulator mechanism. The outer drum conveying line is provided with a plurality of outer drum tool plates used for holding outer drums so as to convey the outer drums. The bearing inner ring heating device comprises a heating shaft, a heating assembly used for heating the heating shaft and a lifting mechanism capable of driving the heating shaft to be inserted into a bearing inner ring of each outer drum, and the bearing inner rings can be heated through the heating shaft so as to be expanded. The inner drum loading manipulator mechanism can clamp inner drums from theinner drum conveying line and load the inner drums into the outer drums which are heated by the bearing inner ring heating device on the outer drum conveying line, at the moment, the bearing inner rings are heated to be expanded, and thus barely no resistance exists when rotating shafts are loaded, assembling is simple and rapid, and assembling precision is high.