The invention belongs to the technical field of chemical sludge treatment, and particularly relates to a device and process for treating chemical dangerous and waste sludge. The device comprises a storage trough A, a high-position storage trough, a storage tank, a mixed oil tank, a storage trough B, a finished oil storage trough, a sewage storage tank, a mixed tank, a reaction still, a condensation tank, a screw pump, a stirrer A, a high-pressure plunger pump, a stirrer B, a high-pressure pump, a sludge pump, a chemical pump, a preheater, a circulating water cooling device, a circulating water condensation device, an ultrasonic generator, a transducer, a cross-flow ceramic film assembly and a reducing valve. Compared with the prior art, the device and process have the advantages that the problems of reaction still corrosion and hard industrial amplification caused by super criticality are avoided; generated solid waste is reduced; a reflux device is additionally arranged, the use amount of a solvent is reduced, and the solvent residual amount in oil and water is reduced; the problems of high cost and large secondary pollution are avoided.