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Abstract. Until now, the concrete utilization of frying cooking oil (jelantah) has not been optimal. This study seeks to convert this waste into biodiesel. Given that used cooking oil still contains high concentration of free fatty acids which can be converted into methyl esters through trans-esterification by methanol. This effort is in line with the increasing demand for renewable energy sources. The waste contains high of free fatty acids concentration and rancidity number. Therefore it is necessary to think about the proper process conditions and the use of superior catalysts for trans-esterification. One of the allegedly superior catalysts is ferrit-based nanocomposite catalyst, namely SrO@CoFe2O4. This hypothesis is based on the properties of ferrite which is thermally and chemically stable, and its magnetism, high reactivity (because it is in the form of nano-sized particles), and its composite with strong base oxide SrO which is insoluble in methanol. The purpose of this study was to synthesize and characterize SrO@CoFe2O4, then apply it as a catalyst in biodiesel production from the waste. The main steps include: (1) synthesis of CoFe2O4 with co-precipitation; (2) Impregnation of SrO into CoFe2O4 and converted to SrO@CoFe2O4; (3) characterization of the synthesized material with XRD, EDX and Zetasizer; (4) application of SrO@CoFe2O4 to biodiesel production from used cooking oil; (5) characterization of biodiesel produced. Based on the results of XRD and EDX analysis, the SrO@CoFe2O4 catalyst has been successfully synthesized. The application of catalysts on waste-based trans-esterification provides a conversion of 80-90%.