The invention discloses a preparation method for an iron-
nickel-
molybdenum soft
magnetic alloy sheet. Iron and
molybdenum are molten in a vacuum induction
smelting furnace first according to the
mass ratio of 1:1-1.2, and
molybdenum-iron intermediate
alloy blocks are formed through pouring; then according to a
mass ratio, 2%-8% of molybdenum-iron intermediate
alloy blocks, 75%-85% of
nickel, 0.05%-0.4% of
phosphorus, 0.1%-0.45% of
sulfur and
smelting pure iron with the
residual mass percent are molten in the induction
smelting furnace, when the temperature of a
molten alloy melt is increased to 1530-1580 DEG C, the
alloy sheet is formed through quick solidification pouring, the sheet is soaked into water to be cooled and is then subjected to
drying treatment, and the alloy sheet uniform in thickness, free of agglomeration and little in oxidation is obtained. Through the preparation method, the problem of large burning loss of
precious metal molybdenum during smelting of iron-
nickel-molybdenum alloy can be solved, the prepared alloy sheet can be directly used for a
powder making procedure, alloy
powder is obtained through ball milling, the technological process is simplified, production cost is reduced, meanwhile, the condition of alloy oxidation during production is reduced, and product performance is improved.