The invention discloses the technical field of cleaning agents and particularly relates to a cleaning agent used for eliminating a radioactive pollutant on the surface of an object, the cleaning agentcomprises the following components by volume: 35-45 parts of an EHS0106 cleaning agent, 1-2 parts of a mixture, and 150-300 parts of a solvent, the cleaning agent finishes cleaning the dirt by usingthe chemical dissolving action and the physical stripping action, the scale, the rust and the radioactive dirt on the surface of the object are separated from an iron body, the ions like Ca<2+>, Mg<2+>, Fe<2+>, UO22+ and U4+ rapidly form a complex and a chelate through the mixture, the dirt is promoted to dissolve rapidly, the dirt enters a cleaning fluid, the degree of the radioactive pollution of steel and iron materials and equipment on the production field are greatly reduced, the reuse ratios of the steel and iron materials and the equipment on the production field are increased, the level of radioactive pollution is reduced, the working environment is improved, and the cleaning agent is favorable for the body health of an operation staff.