A natural antioxidant extracted from the shell of the cashew nut (CNSL) to improve the oxidative stability of jatropha biodiesel was evaluated.The oxidation stability at different temperatures of pure jatropha biodiesel and biodiesel with different concentrations of CNSL and propyl gallate was evaluated using the Metrohm 873 Rancimat equipment.It was found that there is a gradual increase in the induction time with the amount of antioxidant, and evaluation at higher temperature cause a decrease in this variable.Statistical analysis of the results was performed using ANOVA tables and oxidation can be described using a first order kinetics.The rate of consumption of CNSL in jatropha biodiesel was adjusted using the Arrhenius equation and activation energy of 103.94 kJ / mol was obtained