Security defense system for unloading cobalt source transport package

The utility model relates to the technical field of industrial irradiation, and discloses a safety defense system for unloading a cobalt source transport package, which comprises a base, the upper end of the base is fixedly connected with a source tank assembly, the right side of the source tank assembly is fixedly connected with a hose, and the upper end of the hose is fixedly connected with a connecting pipe 1. According to the safety defense system for unloading the cobalt source transport package, when water needs to be injected into the source tank assembly, the pure water tank assembly is lifted, so that a valve VI of the pure water tank assembly is higher than the source tank assembly, and pure water in a pure water tank shell flows into the source tank body through a connecting pipe I and a hose under the action of height difference; quickly cooling until the inner hanging basket and the like are completely immersed; and when soaking is completed, the pure water tank assembly descends, so that the wat