The invention discloses a diluent recovery device and a recovery method thereof. The diluent recovery device comprises a temporary storage barrel, a distiller and a solvent barrel. The temporary storage barrel is used for temporally storing waste diluent to be recovered. The distiller is used for carrying out high-temperature distilling on the waste diluent to be recovered and outputting a diluentsolvent. The solvent barrel is used for temporally storing the diluent solvent. The distiller comprises a waste distiller input pipe used for inputting the waste diluent to be recovered and a distiller solvent output pipe used for outputting the diluent solvent. According to the diluent recovery device and the recovery method thereof, by means of high-temperature distilling of the distiller, thesolvent of the diluent is separated out and is stored through the solvent barrel to be reused, the solvent can be used for washing chains, and the material purchasing cost is reduced for a company. Meanwhile, after the solvent is recovered, liquid printing ink becomes a solid state after evaporation, waste disposal is facilitated, and the disposal cost generated by waste discharging is reduced.