Preparation method of ultramicro copper-infiltrated powder

The invention discloses a preparation method of ultramicro copper-infiltrated powder. The preparation method of the ultramicro copper-infiltrated powder comprises the following steps that after copperand iron are proparted, the iron and the copper are mixed, evaporated by self heating under the induction of high-frequency or medium-frequency current, nitrogen is introduced in an evaporation process to enable copper and iron steam to form regional saturation so as to nucleate and grow and form particles, and thereby obtaining solid powder particles I; iron, neodymium and boron are mixed and smelted to obtain an alloy ingot, the alloy ingot is placed in a closed container, the container is vacuumized at the room temperature, then high-purity hydrogen is introduced, pressure is increased, the alloy ingot is made to absorb hydrogen and burst, after hydrogen absorption is stopped, vacuumizing and dehydrogenation are conducted, and thereby obtaining solid powder particles II; and the solidpowder particles I and II