The application provides a multi-material interlayer and intra-layer double-composite digital differential sanding device, which comprises a plurality of combined lifting sand dischargers, a sanding printing device, a forming platform, a support frame, a base and a detection sand supplementing device, wherein the plurality of combined lifting sand dischargers are composed of a sand scraping plate, a plurality of combined sand storage boxes, a motor and a spiral sand feeder, the sanding printing device is composed of a printing
nozzle, a sand A storage box, a sand B storage box, a gradient mixed sanding box, a scraping plate, a twisting mechanism, a heating
pipe and an
extrusion stirring device, and the detection sand supplementing device is composed of a detection device and a sand supplementing device. The multi-material
casting obtained by the device has excellent performance, the thermal
physical property parameters of each part change uniformly in gradient, which is beneficial to uniform heat dissipation of the
casting and collapse of the sand mold during pouring, fully plays the advantages of multi-material
heat transfer and heat storage, and realizes high-
throughput preparation of the continuous gradient
transition layer of the multi-material sand mold.