The invention provides a method for preparing a high performance anisotropic Nd-Fe-B magnet in a non-liquid phase condition. In the method, the nanocrystalline Nd-Fe-B powder is subjected to hot pressing treatment to obtain an isotropic magnet, and then the isotropic magnet is subjected to low-speed thermal deformation or creep thermal deformation treatment in the absence of a liquid phase to prepare the anisotropic Nd-Fe-B magnet. Compared with the prior art, the invention has the advantages of using low speed and creep deformation to promote grain boundary diffusion and grain boundary creep,thereby improving the directional evolution of grain boundaries under pressure during deformation, overcoming the defect that the prior art is difficult to form the Nd-Fe-B magnet in the non-liquid phase condition or the texture is weak, achieving simultaneous improvement of the texture, residual magnetism and magnetic energy product of the Nd-Fe-B magnet in the non-liquid phase condition, and acquiring the high performance anisotropic Nd-Fe-B magnet in the non-liquid phase condition.