The invention discloses long-life cold-recycling asphalt concrete and a preparation method thereof, and belongs to the technical field of cold recycling of waste asphalt pavements. The long-life cold-recycling asphalt concrete is prepared by mixing the following raw materials in parts by weight: 100 parts of crushed waste asphalt mixture, 1-5 parts of calcium oxide powder, 3-7 parts of emulsifiedasphalt and 1-4 parts of aluminum sulfate. The invention also specifically discloses a preparation method of the long-life cold-recycling asphalt concrete. According to the product, the bonding performance between a new bonding material and an old mixture is effectively improved, and the durability and deformation resistance of the recycled asphalt pavement are effectively guaranteed while the utilization rate of the old mixture is increased. The asphalt concrete can be mixed and constructed at normal temperature, so that the traffic can be quickly recovered, and the energy-saving and emission-reducing effects are obvious.