Since the end of 20th century, waste oil has brought serious food security crisis in China. Our government has made some achievement by using the policy of “Integration of Blocking and Dredging” in blacken agricultural (food) supply chain. However, there are still a lot of restaurant garbage which failed to be disposed by the government’s formal channels so that “Black food” is still presented on people’s table. Therefore, this paper first analyzes the difficulties in control, law, restaurant-kitchen garbage recycling, “Black products” identification, critical control points and bio-energy enterprises and then puts forward suggestions to guarantee the safety of agro-supply chain quality from the sources. The suggestions include reestablishing control system and regulators’ regulation oriented to the whole process of supply chain; combining cracking down “underground economy” with normalized regulation of agro-industries; promulgating and consummating relevant technical standards and laws and regulations as soon as possible; establishing long-term effective mechanism on supervising restaurant garbage.