The invention belongs to the technical field of sand mould 3D printing equipment, and particularly relates to a laser 3D printing platform for sand mould manufacturing. The laser 3D printing platform is characterized by comprising a base, stand columns arranged around the base, a suspended framework arranged on the tops of the stand columns, a lifting system arranged on the base, a shifting system arranged above the lifting system, a sand laying platform arranged on the shifting system, a fixed sand box arranged at the periphery of the sand laying platform, a material collecting box arranged on the side plate of the fixed sand box, wherein the top of the fixed sand box is fixedly connected to the suspended framework through a bolt. The laser 3D printing platform is quick and convenient in process inspection and process correction, is stable in structure and is high in transmission efficiency; the printing platform can move up and down in the fixed sand box 1, so that layer-by-layer printing of the sand mould is ensured; the fixed sand box 1 is formed by fixing four box plates through bolt assemblies, so that sand loosening is prevented and sand bonding quality is improved, and therefore, sand solidifying and forming within a sand mould workpiece area are ensured, and sand pieces are loaded and conveniently transferred.