The invention relates to a new crystal form of cefamandole nafate and crystallization and preparation methods thereof. Characterization is performed at a diffraction angle of 2-theta degrees and a characteristic peak of DSC by using an X-ray powder diffraction spectrum; and the obtained object is defined as a crystal form VII of cefamandole nafate. The preparation method comprises the following steps: adding solid cefamandole nafate into a solvent so as to prepare 0.05-0.4 g/ml of suspension; completely dissolving solids at a temperature of 35-40 DEG C; dropwise adding a solventing-out agent in a solution, wherein the application amount of the solventing-out agent is 2-8 times as large as the volume of the solvent; heating to 50-70 DEG C, evaporating the solvent at a temperature of 50-70 DEG C, and carrying out suction filtration on the obtained suspension, so that a wet product is obtained; and drying the cefamandole nafate product until the weight of the product is constant, so that a new crystal form product of cefamandole nafate is obtained. The crystal form product has high thermal stability, and is not easily deteriorated when stored; and the appearance of the new crystal form is in the shape of a thick stick, but traditional stable crystal forms are in the shape of a fine needle, so that the new crystal form product has better liquidity, thereby significantly improving the packaging and transportation convenience of products.