The invention relates to a building method of a rotavirus infection suckling mouse experiment model. The method concretely comprises the following steps that 7-day-old ICR suckling mice are used as experimental animals; a 1ml improved injector is used; 0.2ml of rotavirus liquid is given in an intragastric administration mode. The model provided by the invention can simulate features of infant rotavirus infection acute gastroenteritis; the rotavirus infection suckling mouse experiment model is fast built; the sufficient number of mice infecting the rotavirus are obtained; the stability is good; the repeatability is realized; the model building success rate is high and is nearly 100 percent. In addition, the technical scheme provided by the invention has the advantages that the weight of the selected low-age animals is light; the obtaining is easy; the used virus dose is small; the experiment cost is reduced; the method is applicable to batch modeling.