Rare earth magnet and preparation method thereof

The invention discloses a rare earth magnet and a preparation method thereof. The magnet components of the rare earth magnet are as follows: RaFebalCobBcAld1M1d2M2e, wherein R is one or more rare earth elements including Nd; M1 is one or more of Cu, Ga, Al, Zn, Ge, Ag, Cd, In or Sn; M2 is one or more of Zr, Nb, Ti, Hf, V, Ta, Cr, Mo or W, wherein a is greater than 13.0 and less than 15.7; b is greater than 0.20 and less than 2.50; c is greater than 5.0 and less than 6.1; d1 is greater than or equal to 0 and less than 2.2; d2 is greater than 0 and less than 1.5; e is greater than 0 and less than 0.45; m is equal to (a-2(c-2e))/(0.5d1+d2), and n is equal to b/(d1+d2), wherein m is greater than 3.5 and less than 9, and 2 is greater than 0.2 and less than 2.5. The preparation method comprisesthe following steps that the raw materials are added twice to prepare alloy cast pieces, and then the alloy cast pieces are subjected to crushing, fine powder mixing, orientation pressing, low-temperature preheating, and sint