Fuente: WIPO "dairy products" The invention particularly relates to a packaging integrity checking method of a composite paper base material milk packaging box, belonging to the technical field of dairy product processing. The packaging integrity checking method of the composite paper base material milk packaging box comprises the following steps: properly spreading and slightly squeezing a sample to be checked; stripping a PEfilm and a paper layer; placing the sample in an alkali solution of 60-65 degrees centigrade and then taking out the sample, washing and drying the sample; drying and squeezing the sample to see whether the milk is leaked or not; if the milk is leaked, determining that the sample is unqualified; and if no milk leaks, cutting the sample from the middle, pouring out the milk and rinsing off with water; and then pouring red ink into the sample and keeping for 15min; if the red ink oozes out, determining that the sample is unqualified; and if no red ink oozes out, determining that the sample is qualified. The packaging integrity checking method of the composite paper base material milk packaging box disclosed by the invention has simple operation and direct result, and the packaging integritychecking method of the composite paper base material milk packaging box disclosed by the invention can be used to determine whether the composite paper base material milk packaging box is complete ornot; therefore, the packaging leakage due to filling equipment, packaging materials and the like resulting in deterioration of milk is avoided, and food safety is ensured.