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Alumina based catalysts play an important role in the process of optimizing crude oil processing. Platinum/alumina (Pt/Al2O3) is an alumina based catalyst that is widely used in the oil production process, as a consequence leaving a lot of catalyst waste. In this catalyst waste, the Pt metal is an important content, which has a high economic value. In this study, we focused on processing Pt/Al2O3 catalyst waste to separate Pt metal content from the catalyst. Optimization of Pt metal separation was carried out using a sonoleaching procedure under different conditions. We noted a significant change in the color of the catalyst from gray to yellow and a reduction in mass at an increase in temperature of up to 50oC during the sonoleaching process. Furthermore, the effect of temperature on recovery of Pt metal was investigated by morphological analysis and elemental content in Pt/Al2O3 catalyst waste. Our results will provide additional knowledge and reference in optimizing Pt recovery in Pt/Al2O3 catalyst waste for the reuse of Pt metals in various applications.