The invention discloses a bacterium for degrading herbicides and application thereof. The bacterium for degrading the herbicides is Rhizobium sp. 198-L-30 which has the collection number of CGMCC No. 9864 in the China General Microbiological Culture Collection Center. According to the Rhizobium sp. 198-L-30 with the collection number of CGMCC No. 9864 provided by the invention, the degradation rate on 100mg/L of imazethapyr in an inorganic salt culture medium within 7 days is 93.40 percent; the degradation rate on 50mg/L of acetochlor is 88.44 percent; the degradation rate on 100mg/L of chlorimuron-ethyl is 41.15 percent; and the degradation rate on 100mg/L of acifluorfen is 12.28 percent. According the strain, the herbicides such as imazethapyr, acetochlor, chlorimuron-ethyl and acifluorfen can be degraded.