The invention discloses a cultivation method for a new variety of Chinese herbaceous peony. The method is characterized by comprising the following steps of preservation at constant temperature, wherein firstly, Chinese herbaceous peony seeds are sterilized and soaked, and then put into a constant-temperature tank and preserved; ionization activation, wherein the preserved seeds are soaked into aninductive agent and ionized; mutagenesis at variable temperature, wherein the ionized seeds are soaked into protective liquid, and the mixture is put into a variable-temperature tank and subjected tovariable temperature processing; cultivation in a greenhouse, wherein the mutagenesis seeds are sowed to a seedling bed, covered with soil, watered with the protective liquid, and cultivated in the greenhouse, and ultraviolet light is used for irradiating the seeds at the seed germination stage; hybridization, wherein Chinese herbaceous peony seedlings are transplanted in early March of the nextyear, Chinese herbaceous peony variant plants are obtained, original Chinese herbaceous peony plants are used as female parents, the Chinese herbaceous peony variant plants are used as male parents, first-generation Chinese herbaceous peony is obtained after the hybridization, the first-generation Chinese herbaceous peony and the variant plants are hybridized to obtain second-generation Chinese herbaceous peony, the second-generation Chinese herbaceous peony is subjected to intraspecific cultivation, and new variety seeds are obtained and cultivated.