The utility model discloses a bone meal preparation device which comprises a steam cooking pot and a hydraulic cylinder, wherein the steam cooking pot comprises a pot body; a guide-out tube for guiding out an oil-water mixture inside the pot body is arranged at the bottom of the pot body; the hydraulic cylinder comprises a cylinder body; a connecting tube for supplying liquid into the cylinder body is arranged on one side of the cylinder body; and the connecting tube is communicated with the guide-out tube. As the guide-out tube for guiding out the oil-water mixture inside the pot body is arranged at the bottom of the pot body, subsequently the guide-out tube is communicated with the connecting tube, and the liquid is provided for the hydraulic cylinder, so that the energy utilization rate is increased; and moreover, by arranging a plurality of vertical steam supply tubes inside the pot body and arranging a screening net for supporting materials in the middle of the pot body, the materials are separated from the oil-water mixture, and the production efficiency of the bone meal is improved.