The invention discloses a block-shaped or sheet-shaped processed cheese and a preparation method thereof. The method comprises the following steps: (1) mixing raw materials: completely mixing solid sugar materials, emulsifying salt and a calcium preparation and dissolving into water at the temperature of 50 to 65 DEG C, mixing with other raw materials uniformly, stirring at the rotating speed of 1,500 to 3,000 rpm under the heating condition until the temperature is 55 to 70 DEG C and then stirring for 2 to 5 minutes, wherein the raw materials comprise 50 to 75 weight percent of natural cheese, 3 to 12.2 weight percent of fat product, 5 to 10 weight percent of sugar material, 2 to 5 weight percent of emulsifying salt, 0.0002 to 0.0004 weight percent of folic acid, 1.3 to 2.5 weight percent of calcium preparation and 2 to 20 weight percent of water; and (2) shearing and emulsifying: heating the materials obtained in the step (1) at the rotating speed of 1,500 to 3,000 rpm to 90 to 95 DEG C, performing pasteurization, preserving heat for 1 to 3 minutes, emulsifying at slow speed, filling and quickly cooling to obtain the product. The cheese can comprehensively supplement nutrients, is suitable for pregnant women, convenient to eat and easy to carry, has high energy, adjusts energy supply of the pregnant women, intensifies calcium and folic acid, and has proper viscosity, high quality and soft flavor of the processed cheese.