The invention belongs to the field of health-care beverages, and relates to an additive of a radiation-resistant functional beverage, and additive-containing barley green milk wine and an additive-containing tea beverage. The additive consists of the following raw materials in part by weight: 30 to 35 parts of barley green, 30 to 35 parts of red bean, 12 to 15 parts of Chinese wolfberry, 12 to 15 parts of dried longan, 12 to 15 parts of red jujube, 5 to 8 parts of American ginseng, 12 to 15 parts of lucid ganoderma, 1 to 2 parts of Chinese caterpillar fungus, 12 to 15 parts of rhodiola, 12 to 15 parts of rose, 12 to 15 parts of roselle, 12 to 15 parts of ginkgo leaf and 10 to 12 parts of liquoric root. The additive can be used for brewing radiation-resistant functional barley green milk wine, can be used for preparing a radiation-resistant functional tea beverage and other various beverages, and can be prepared into a solid tea bag. The milk wine and the tea beverage prepared by the additive have the effects of strengthening health care, enhancing immunity, resisting oxidation and fatigue, delaying senility and the like, an obvious radiation-resistant effect and the effects of improving and protecting tissue proteins, nuclear proteins, enzymes and the like of organs harmed by photoelectricity and various rays of a human body.