Composite hollow sphere and preparation method thereof

The invention discloses a composite hollow sphere and a preparation method thereof, the composite hollow sphere comprises a spherical inner core taking a foamed polystyrene small sphere as the composite hollow sphere, and the outer surface of the spherical inner core is uniformly coated with a plurality of layers of sawdust resin mixtures from inside to outside until the hollow sphere reaches the target density. The diameter of the composite hollow sphere is 2.0-100.0 mm, the wall thickness of the composite hollow sphere is 0.2-5 mm, and the density of the composite hollow sphere is 100-800 kg/m < 3 >. The foamed polystyrene spheres are adopted as the spherical inner core of the composite hollow sphere, the outer surface of the spherical inner core is uniformly coated with the multiple layers of sawdust resin mixtures from inside to outside, the process is relatively simple, the product performance is relatively stable, the composite hollow sphere is suitable for batch production, and sawdust has the reinforc