The invention belongs to the technical field of mixing equipment, and specifically provides a raw material mixing device used for inflatable model processing. According to a scheme of the invention, the raw material mixing device comprises a fixed plate, wherein a fixed cavity is arranged on the fixed plate; the inner walls of two sides of the fixed cavity are respectively provided with a groove;a same lifting plate is fixedly arranged on the inner walls of the top parts and the inner walls of the bottom parts of the grooves; the bottom part of the lifting plate is fixedly provided with one ends of springs; the other ends of the springs are correspondingly and fixedly arranged on the inner walls of the bottom parts of the grooves; a plurality of pressing plates are fixedly arranged at thebottom part of the lifting plate; a same filtering plate and a same round rod are fixedly arranged on the inner walls of two sides of the fixed cavity; a sliding seat is slidably arranged on the round rod; one side of the sliding seat is provided with a sliding hole; and the sliding seat is slidably connected with the round rod through the sliding hole. The raw material mixing device provided bythe invention has simple novel structure, is convenient to use, can fully stir raw materials, further crushes stirred raw materials, and can prevent blockage during filtering.