The invention discloses a heating and heat insulating feeder sleeve. The heating and heat insulating feeder sleeve is used for feeding in a casting mold. The heating and heat insulating feeder sleevecomprises a matrix, a heating layer, a heat insulating layer and a protecting layer. A feeding cavity is formed in the matrix and communicated with the interior of the casting mold, the heating layeris arranged on the inner wall of the feeding cavity, the matrix is coated with the heat insulating layer, and the heat insulating layer is coated with the protecting layer. The heat insulating layer is prepared from a polystyrene composite. The polystyrene composite is prepared from, by weight, 50-80 parts of expandable polystyrene, 40-60 parts of polyurethane plastic, 40-50 parts of nitrile silicone rubber, 1-2 parts of physical foaming agent, 1.5-2.5 parts of sodium lignosulphonate, 2-4 parts of disproportionated rosin, 10-20 parts of heat insulating vermiculite, 2-4 parts of polyacrylonitrile-based carbon fibers, 10-18 parts of diatomite, 2-4 parts of insulating glass beads, 8-16 parts of sepiolite powder, 1.5-2.5 parts of p-methylsulfonic acid, 2-4 parts of phosphoric acid and 40-60 parts of water.