The invention provides a microbacterium oxydans for degrading a polycyclic aromatic hydrocarbon and the application thereof. Particularly, the invention provides a microbacterium oxydans Ji2 strain with a preservation number of CGMCC No.9072 and the application effect of the microbacterium oxydans in emulsifying and degrading crude oil and the polycyclic aromatic hydrocarbon and performing indoor physical simulation oil displacement. According to the microbacterium oxydans strain, the crude oil can be emulsified and degraded under aerobic and anaerobic conditions by taking the crude oil or the polycyclic aromatic hydrocarbon as the only carbon source and energy source, the degradation rate of the degraded polycyclic aromatic hydrocarbon, such as naphthalene is up to 100 percent, and analysis on the degraded crude oil shows that aromatic hydrocarbon and colloid, which are the components of the crude oil, are mainly degraded. The stain can be used for degrading the polycyclic aromatic hydrocarbon in an environment by the performance of the stain, and can also be applied to microbial enhanced oil recovery, and the oil recovery is improved.