The invention belongs to the technical field of recovery from Fischer-Tropsch paraffin residues and particularly relates to a device and a method for recovering paraffin from the Fischer-Tropsch paraffin residues. The device comprises a pyrolysis furnace, a precipitator, a condensing device and a gas-liquid separator, wherein the pyrolysis furnace is connected with the precipitator which is connected with the condensing device, and the condensing device is connected with the gas-liquid separator which is connected with the pyrolysis furnace; an inner barrel and an outer barrel are arranged in the pyrolysis furnace, a boost screw is arranged in the inner barrel, and a flue is formed between the inner barrel and the outer barrel; the pyrolysis furnace is further provided with a nitrogen inlet and a residue discharge port. The device and the method have the advantages that the purpose of paraffin recovery is achieved through separation of the paraffin from catalyst residues, the effective constituent yield of the paraffin residues is higher than 82%, produced non-condensable gas returns to the hearth of the pyrolysis furnace for combustion, flue gas emission is reduced, and the method is a clean process for recovering the paraffin from the Fischer-Tropsch paraffin residues.