The invention provides an arthrobacter and an application thereof. The arthrobacter is YC-RL1 collected with the serial number of CGMCC No.10611 and can be used for simultaneously degrading a mixture composed of 100mg/L naphthalene, 100mg/L fluorene, 100mg/L biphenol, 100mg/L 1, 2, 3, 4-tetrachlorobenzene and 100mg/L p-nitrophenol in an inorganic salt within 4 days. The arthrobacter has a relatively-wide tolerance range for salt ion concentration and can be used for simultaneously degrading a mixture composed of five 100mg/L compounds in an inorganic salt ion culture medium with the NaCl concentration of 0-60g/L within 5 days. YC-RL1 can be applied to biological remediation of an environment polluted by naphthalene, fluorene, biphenol, 1, 2, 3, 4-tetrachlorobenzene and p-nitrophenol and an environment simultaneously polluted by various pollutants, also has a favorable application potential for high-salt industrial production wastewater treatment of the pollutants and also has a relatively-high economic value and a relatively-good application prospect.