The two are not the same, ISO is an international standard certification.

QS is a food "quality standard" Quality Standard ") of the English acronym, with the QS logo of the product represents the approval of the state of all food manufacturers must undergo a mandatory inspection, qualified and in the smallest sales unit of the Food production license number marked on the packaging and printing of food quality and safety market access mark ("QS" mark) before leaving the factory for sale. No food quality and safety market access mark, shall not be sold. Since January 1, 2004, China first in rice, edible vegetable oil, wheat flour, soy sauce and vinegar five categories of food industry to implement food quality and safety market access system. At present, China has implemented 28 categories of food production license system, the system includes material submission, on-site review, etc., the manufacturer must be based on the General Hygienic Norms for Food Production, General Principles for the Review of Food Production Licenses, product category review rules, product standards.

ISO is the English acronym for an organization. Its full name is International Organization for Standardization, translated into Chinese is ISO certification "International Organization for Standardization".