The invention discloses a preparation method of an amorphous nanocrystalline alloy with high magnetic permeability. The preparation method comprises the following steps that the weighting is carried out according to the content of the various elements in the amorphous nanocrystalline alloy component expression, the amorphous nanocrystalline alloy component expression is FeaCobSicBdCueMfM'g, wherein M is at least one of V, Ta and Nb, M' is at least one of Ti, Zr, Hf, Ni, Ge, Cr, Mn, W, Zn, Sn, Sb, Mo, Y and Al; a, b, c, d, e, f and g represent the atomic percent content of the corresponding element; a, b, c, d, e, f and g satisfy the conditions that a is less than or equal to 82 and greater than or equal to 74, b is less than or equal to 5 and greater than 0.01, c is less than or equal to 15 and greater than or equal to 5, d is less than or equal to 13 and greater than or equal to 4, e is less than or equal to 1.5 and greater than or equal to 0.2, f is less than or equal to 4 and greater than or equal to 1, and g is less than or equal to 1 and greater than or equal to 0 and a + b + c + d + e + f + g is equal to 100. The mother alloy is smelted, the amorphous alloy strip is prepared,and the amorphous alloy strip is subjected to magnetic field heat treatment to obtain the nanocrystalline alloy material. The nanocrystalline alloy material has an effective permeability of 100 kHz or less and has the effective permeability of 35,000kHz or above, and meanwhile, the nanocrystalline alloy material has a saturation magnetic induction intensity advantage of 1.35 T or above.