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SmB6,a topological Kondo insulator,with a gapped bulk state and metallic surface state has aroused great research interest.Here,we report an exotic hysteresis behavior of magnetoresistance in individual SmB6 nanowire in a temperature range in which both surface and bulk states contribute to the total conductance.Under a magnetic field parallel to the SmB6 nanowire,the resistance suddenly increases at the tuming point from up-sweep to down-sweep of the magnetic field.The magnetoresistance hysteresis loops are well consistent with the magnetocaloric effect.Our results suggest that the SmB6 nanowires possess potential applications in the magnetic cooling technology.