The invention relates to a cefamandole nafate new crystal form and a crystallization preparing method thereof. The cefamandole nafate new crystal form is characterized by characterizing the characteristic peaks of a diffraction angle 2 theta degree and a DSC by using X-ray powder diffraction patterns, wherein the cefamandole nafate new crystal form is defined as VI. The preparing method comprises the following steps of adding the cefamandole nafate solid into the good solvent, and mixing at the temperature of 10-30 DEG C to enable the cefamandole nafate to dissolve completely, wherein the solution concentration is 0.05-0.4 g/ml; adding additives at different concentrations into the solution; adding a solventing-out agent into the solution, wherein the dosage of the solventing-out agent is 5-20 times the dosage of the good solvent; after cultivating the crystal, performing suction filtration on formed suspension liquid; drying to obtain a cefamandole nafate new crystal form product. The solubility of the new crystal form is improved by more than 5%; the new crystal form has higher solubility, so that the dissolution rate of a medicinal preparation can be improved. The traditional stable crystal form is of a needle shape, but the appearance of the new crystal form is of a prism shape, thus, the bulk density of products is improved by more than 8%, better mobility is realized, and accordingly convenience in package and transport of the products is improved.