The invention discloses a salt-tolerant pyrene degrading bactericide applied to oil-containing silt. The salt-tolerant pyrene degrading bactericide is characterized by comprising Paracoccus sp. PH205 and a carrier; the Paracoccus sp. PH205 is preserved in the common microorganism center of China Committee for Culture Collection of Microorganisms on May 16th, 2014, and the preservation number is CGMCC No. 9174. Polycyclic aromatic hydrocarbon pyrene in the salt-containing and oil-containing silt can be degraded quickly by the aid of the salt-tolerant pyrene degrading bactericide; As proved by experiments, the salt-tolerant pyrene degrading bactericide has the advantages that the salt-tolerant pyrene degrading bactericide is high in pyrene degrading speed and wide in salinity application range, and can be used for the oil-containing silt with the salinity of 5% at most, and the content of the polycyclic aromatic hydrocarbon pyrene in the oil-containing silt can be reduced effectively.