The invention discloses a steel-structure-use nuclear-radiation-resistant paint which is characterized in that the paint comprises main agents, a curing agent, and a coupling agent. The main agents comprise epoxy resin, organosilicon modified epoxy resin, a radiation-resistant filling agent, a diluting agent, and a processing auxiliary agent. The paint is prepared from the components of, by mass: 100 parts of epoxy resin, 20-60 parts of organosilicon modified epoxy resin, 50-80 parts of radiation-resistant filling agent, 30-60 parts of the diluting agent, 2-5 parts of the processing auxiliary agent, 25-50 parts of the curing agent, and 1-3 parts of the coupling agent. A mass percentage ratio of the main agents to the curing agent is 6-11:1. The steel-structure-use nuclear-radiation-resistant paint provided by the invention has excellent radiation resistance and decontamination property. The paint does not precipitate environment-polluting harmful substances.