The mold of the brick making machine directly determines the shape, size accuracy and surface quality of the bricks during the brick making process. By replacing different molds, the same brick making machine can produce dozens of products such as hollow bricks, pavement bricks, slope protection bricks, etc., which are suitable for the needs of multiple fields such as construction, municipal administration, and gardening. The material, processing accuracy and structural design of the mold directly affect the production efficiency and the brick qualification rate, and are an indispensable key link in the brick making process.