The invention relates to the technical field of coupling inductors, and particularly relates to and discloses a full-coupling magnetic element, which comprises at least two phases of circuits. Each phase of circuit is formed by connecting a plurality of coupling units, each two phases of circuits are directly coupled through at least one coupling unit, and the directions of magnetic fields generated by respective direct current components in the currents of the two phases of circuits are opposite. According to the full-coupling magnetic element, all phases are directly coupled to one another,and low output current ripples are achieved; the integrated full-coupling magnetic element has very high regularity and expandability, and has the advantages of small size, low cost, strong expansibility and high integration; and the full-coupling magnetic element can be integrated with a peripheral semiconductor chip into a single chip, or the full-coupling magnetic element can be directly manufactured on a wafer which is provided with a semiconductor chip in advance, so that a micro power supply management chip which is highly integrated and does not need an external magnetic passive deviceis formed, and the micro power supply management chip can replace traditional circuits and schemes such as power supply management based on discrete components, and is applied to multiple purposes.