A special forming method for silicon nitride ceramic substrates is especially suitable for forming 0.2MM-3MM thickness flake ceramic products. The production of such products has many advantages, such as high speed, high automation, high efficiency, uniform structure and good product quality. Printing Forming: The superfine powder, mixing agent, lubricant, solvent, etc. are fully mixed to form a slurry with good fluidity, and a very thin blank film can be printed by leaking brush on screen printing machine. After drying, the layer can be repeated several times until the required thickness is reached. It can also alternately print the blank film and the metal electric weight layer until the required number of layers is reached. After drying, other processes such as shearing and roasting are carried out.