The invention discloses a discrete processing method for facilitating progenetic phase distribution of Al-Mg-Si-Cu alloy, and belongs to the technical field of aluminum alloy. The discrete processing method includes the steps that an external field action in the casting process is fully used for increasing the nucleation rate of progenetic phases at first, and accordingly formed iron-enriched phases are made small in dimension and are in an evenly discrete distribution state; and then a subsequent heat processing technology is assisted in for regulation and control, the progenetic iron-enriched phases in the Al-Mg-Si-Cu alloy can be evenly dispersed to be distributed in an alloy matrix, and meanwhile the distribution is mainly based on spherical distribution, so that the effect that no breaking or microcracks are generated in subsequent processing is guaranteed. By the adoption of the processing method, distribution uniformity of the progenetic phases in the aluminum alloy can be greatly improved, and the combination property of the alloy is improved obviously. The discrete processing method is quite suitable for being applied to manufacturing of novel automotive aluminum alloy, in particular to manufacturing of complicated shape parts with high requirements for stamping performance, strength, surface quality, edge bending performance and the like.