The utility model provides a device for recovering residual liquid of a reaction kettle. According to the recovery device, a condenser connected with the reaction kettle is arranged at the upper part of the reaction kettle; a liquid collecting box communicated with the condenser is arranged below the condenser; a branched pipeline is arranged on the liquid collecting box; the other end of the branched pipeline is connected with a control valve and a pump; if residual reaction solvents exist in the reaction kettle, the residual reaction solvents can be timely sucked through negative pressure generated by the pump and are connected to a feeding port of the reaction kettle through a pipeline, and the sucked solvents are reused. Therefore, the production efficiency is improved and the production cost is saved.