The invention discloses a method for preparing animal particle feed with iva xanthifolia of an invasive plant, which is characterized by taking invasive plant-iva xanthifolia growing in China as main raw material. Iva xanthifolia is dried and crushed by a crushing mill to be produced into grass powder. 40 to 60 percent of the grass powder of iva xanthifolia, 11 to 21 percent of corn meal, 10 to 20 percent of bean cake powder, 9 percent of wheat bran, 3 percent of fish meal, 5 percent of bone meal and 1 percent of yeast powder according to the formula (calculated by weight percentage) are mixed by a stirrer, processed into the particle feed by a granulator. The particle feed can be fed herbivores such as cattle, sheep, rabbits, etc. The raw material of the method is easy to obtain, the processing technique is simple, feeding cost is low, palatability is good, thereby being capable of meeting the need of herbivores such as cattle, sheep, rabbits, etc. Meanwhile, the method changes waste into valuables, makes full use of the invasive plant, has wide popularization and application prospect, certain economic benefits and social benefits and important significance to the promotion of rural economic development and further richens the development of Chinese feed industry.