The invention relates to the field of oil field crude oil treatment, particularly to a demulsification dehydration apparatus for aged crude oil. The demulsification dehydration apparatus comprises a box body, wherein a constant temperature circulation system for providing high temperature active water is arranged in the box body, the upper portion of the box body is provided with an oil overflow port, at least a rotary rolling kneading demulsification mechanism is arranged in the box body, each rotary rolling kneading demulsification mechanism has a fixed end surface and a relatively fixed endsurface rotary end surface, the two end surfaces cooperatively perform rotary motion, the fixed end surface has an aged crude oil inlet hole and a matched liquid supply pipeline, and the rotary end surface is supplied with rotary power by a mechanical transmission device, and is provided with a spring applying mechanism. According to the present invention, the aged oil mechanical treatment deviceis provided, the oil-water separation is achieved, the demulsification dehydration of the aged oil is effectively achieved, the utilization rate of the recovered crude oil is improved, and the purposes of cost reduction, yield increase and efficiency increase are achieved.