The nuclear grade mixed bed resin is a mixed bed special ion exchange resin which has been premixed and can be directly applied to the field of nuclear power. It is mainly used for the production of ultrapure water in water treatment systems containing radioactive materials, semiconductor preparation, etc., and can also be used for fine treatment after various water treatment processes. The nuclear grade mixed bed resin provided by Jiangsu kingshan New Material Co., Ltd. has low organic content and low impurity ion characteristics, and can be used directly without pretreatment and regeneration.