The invention discloses a pyrolysis oil filter device. The device comprises a primary filter press and a secondary filter press, wherein both the primary filter press and the secondary filter press comprise pyrolysis oil inlet pipes, oil return pipes, compressed air pipes and filter pressing devices; and filter plates and filter cloth are arranged in both the primary filter press and the secondaryfilter press. On the primary filter press, the pyrolysis oil pipe is communicated with the compressed air pipe; and on the secondary filter press, an air hole is formed in the upper end of the filterplate, the air hole is communicated with the compressed air pipe through an air pipe, and a check valve is arranged on the pyrolysis oil inlet pipe. The pyrolysis oil is filtered and pressed in the primary filter press and then flows into the secondary filter press to undergo secondary filter pressing. The device has the advantages that the oil residues are dry, the oil yield is high and the oilpressing efficiency is improved by three times. After the secondary filter, the impurities in the pyrolysis oil are decreased and the overall quality of the oil is greatly improved. After the secondary filter, the heat value of the pyrolysis oil is improved to 43.65 MJ/KG from the original 38.26 MJ/KG, and the ash content of the oil is improved to 0.005% from the original 0.008%.