Fuente: WIPO "dairy products" The present invention discloses a pretreatment method of a dairy product for determination of total arsenic content in the dairy product, a method for determination of the total arsenic content in the dairy product, and a method for determination of the total arsenic recovery rate of the dairy product. The pretreatment method of the dairy product for determination of the total arsenic content in the dairy product is as follows: (1-1) the dairy product is mixed with nitric acid and hydrogen peroxide for digestion to obtain a digestion product; (1-2) the digestion product is mixed with a thiourea-ascorbic acid solution to obtain a matter to be reacted; and (1-3) a pretreatment product can be obtained by insulation treatment of the matter to be reacted. The pretreatment method of the dairy product for determination of the total arsenic content in the dairy product can accurately determine the total arsenic content in the dairy product, and is high in sensitivity and strong in stability, and in addition, the detected total arsenic recovery rate is high.