The invention belongs to the relevant technical field of additive manufacturing, and particularly relates to a multi-arc synergistic additive manufacturing method applicable to a high-performance metal component. The method comprises the steps that multiple mutually-independent arc guns capable of executing X-Y-Z three-axis translation and angle rotation are arranged for the metal component to be formed, and therefore the relative positions and working states of the arc guns are freely changed; based on a three-dimensional model and a forming path of the metal component, the same or different metal wires are installed on wire feeding systems of the arc guns, and the multi-arc system additive manufacturing process for the metal component is executed by adopting some or combination of multiple modes of a common molten pool, a non-common-molten pool and a partial molten pool according to working condition requirements. By means of the multi-arc synergistic additive manufacturing method, the temperature field of deposited metal can be well adjusted, the metal structure is remarkably improved, the whole arc additive manufacturing process with the higher efficiency and higher quality is achieved, and the multi-arc synergistic additive manufacturing method is particularly applicable to special application occasions of high-performance large complex metal components.