The invention discloses a modified asphalt mixture, relating to the fields of chemistry and chemical engineering. The modified asphalt mixture contains matrix asphalt, an aggregate, mineral powder and a solid SBS modified asphalt mixture modifying agent, wherein the solid SBS modified asphalt mixture modifying agent can form a compact film on the surfaces of the aggregate and the mineral powder after being smelted, and the addition amount of the solid SBS modified asphalt mixture modifying agent is 5wt%-25wt% of the matrix asphalt. The modified asphalt mixture provided by the invention is strong in stripping resistance, easy to prepare and low in cost.