The invention relates to a reaction kettle for solid waste treatment. The reaction kettle comprises a reaction kettle body (1), and a liquid inlet (11) and an overfall gap (12) are arranged above theouter periphery of the reaction kettle body (1); a liquid outlet (13) and a drain outlet (14) are arranged under the outer periphery of the reaction body (1); a drive device (2) is connected to the position above the reaction body 91) through a bearing (3) and drives a stirring paddle (4) in the reaction kettle body (1) to rotate synchronously. By the arrangement, accumulation of stirring materials at the position where a driving shaft and a tool bit are connected is avoided, waste of raw materials is reduced, long running of the stirring paddle is guaranteed, service life of the stirring paddle is prolonged, and maintenance frequency and maintenance cost of the stirring paddle are reduced.