SMA (styrene maleic anhydride) on-site thermal regenerated asphalt mixture

The invention discloses an SMA (styrene maleic anhydride) on-site thermal regenerated asphalt mixture and a preparation method thereof. Raw materials of the SMA on-site thermal regenerated asphalt mixture adopt SMA asphalt pavement milling and planning materials and comprise a regenerated old material and newly added asphalt mixture as well as an additive, wherein the regenerated old material adopts the SMA asphalt pavement milling and planning materials; the additive is SBS (styrene butadiene styrene) modified asphalt, an asphalt regenerating agent or a mixture of SBS modified asphalt and the asphalt regenerating agent; and the newly added asphalt mixture comprises SBS modified asphalt, cellulose fibers and mineral aggregates. According to the preparation method, the SMA asphalt pavement milling and planning materials are taken as raw materials, resource is saved, and environmental pollution is avoided; and the prepared mixture can be applied to an SMA asphalt pavement again, each technical requirement can be met, and preparation cost is reduced.