The invention belongs to the technical field of development and utilization of microbial germplasm resources, and discloses a germ capable of efficiently degrading an autotoxin p-hydroxybenzoic acid and the application of the germ. The bacterial strain is pseudomonas aureofaciens Z-H2 which can tolerate the p-hydroxybenzoic acid at a high concentration and growth by taking the p-hydroxybenzoic acid as a unique carbon source and has an efficient degrading function for the p-hydroxybenzoic acid. Measurement by ultraviolet spectrophotometry is as follows: PA is degraded by 97 percent when 0.1 mg/ml p-hydroxybenzoic acid is cultured for 12 hours; PA is degraded by 98 percent when 1 mg/ml p-hydroxybenzoic acid is cultured for 48 hours; PA is degraded by 97 percent when 5 mg/ml p-hydroxybenzoicacid is cultured for 72 hours. An experiment shows that the bacterial strain has an extremely good degrading effect on the autotoxin p-hydroxybenzoic acid and has a potential application value for relieving a successive cropping obstacle caused by the autotoxin.