Solid rocket engine nozzle diffusion section heat insulation layer forming method

The invention relates to the field of spaceflight solid rocket engine manufacturing, and discloses a solid rocket engine nozzle diffusion section heat insulation layer forming method which comprises the following steps: mounting a winding mold, winding a carbon layer, machining, winding a high-silica heat insulation layer, sealing a vacuum bag, curing, cleaning the vacuum bag, and machining to the size of a diffusion section heat insulation layer blank after demolding. According to the forming method for the diffusion section heat insulation layer of the solid rocket engine jet pipe, prepreg fiber cloth belts with different widths do not need to be frequently replaced when the prepreg fiber cloth belts are wound, the production efficiency of the diffusion section heat insulation layer is effectively improved, and the product size and performance requirements are met.