Rare earth alloy cast plate and its manufacturing method

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The invention relates to a rare earth alloy casting strip and the preparation method. The thickness of the alloy casting strip is uniform, at least the thicknesses of 80% alloy casting strips are in the scope of [mu-0.1 mm, mu+0.1 mm], sigma . Wherein, the my is the average thickness of the alloy casting strips and is in the scope of 0.1-1.0 mm; the sigma is the variance of the thicknesses of the alloy casting strips and represents the dispersion degree of the thicknesses of the alloy casting strips. The composition of the alloy casting strip is R(Fe, M)B, wherein, R represents one or more rare earth elements in the 17 rare earth elements including Sc and Y, whose percentage content is 26.0-50.0 wt%, M is a transition element except Fe, that is one or more in Al, Ga, In, C, N, Si, Ge, Sn, Pb, Mg and Ca, the percentage content of M is 0-10.0%, the percentage content of B is 0-1.5%, and the rest is Fe and inevitable impurities. The preparation method is that : after melt, the constituents below of the rare earth alloy are thrown into alloy strips by a rotating water cooled metallic roller. The alloy casting strip can be made into a sintered rare earth permanent magnet with high performance.