Abstract: Mg/Al multilayered composite sheets were fabricated by electrically-assisted accumulative roll bonding with a current density of about 1×10⁸ A·m^-2. The microstructure and mechanical properties after roll bonding with different number of cylces (1-3 cycles) were studied, and the effect of the electrically-assisted process on the interfacial bonding of the composite sheet and the formation of interfacial intermetallic compounds were revealed. The results show that after the electrically-assisted accumulative roll bonding, the interface between Mg/Al layers was well bonded. With the increase of the roll bonding cycle, the necking of the Mg layer became more and more severe. The introduction of current suppressed the formation of interfacial intermetallic compounds. The elements at the Mg/Al interface presented interdiffusion characteristics, and a 3 μm thick atomic diffusion layer was formed, whose thickness did not increase significantly with the increase of the roll bonding cycle. With the increase of the roll bonding cycle, the tensile strength and hardness of the composite sheet increased first and then decreased, while the elongation decreased. The necking and fracture of the Mg layer during the electrically-assisted accumulative roll bonding process and the accelerated recrystallization of the Mg and Al layers caused by the current resulted in the reduction of the mechanical properties of the composite sheet after three-pass roll bonding.