The invention discloses a pulse-current-assisted aluminum alloy large-area diffusion bonding device and method, and belongs to the technical field of mechanical manufacturing. According to the pulse-current-assisted aluminum alloy large-area diffusion bonding device and method, through accurate control over the parameters such as the temperature, the electric current, the voltage and the like, quick heating and reliable connection of panels are achieved, then the production efficiency is effectively improved, the energy consumption and the cost are reduced, and the problems that an aluminum alloy diffusion bonding interface is poor in bonding strength, the production efficiency is low, the energy consumption is high, and the like are solved.