The invention discloses an old tree black tea processing method. The method comprises the following specific steps: picking tea leaves, sun-drying, withering, twisting, fermenting, drying, cooling, and baking to enhance the aroma. In the method, the withering, fermenting and baking procedures are automated operations, and the operating processes are advanced; and especially the sun-drying procedure is added before withering, thus ensuring that the old tree black tea has a quality style of black tea as well as a quality charm of rock tea and achieves an unique quality flavor. After the old tea tree black tea developed by the special process is infused, the soup has a bright color, thus refreshing to the heart and pleasing to the eyes and having an unique lingering charm; the aroma is more unique, flower aroma can be inhaled at the first smell, fruit aroma can be tasted when sipping the tea soup, and honey aroma lasts in the mouth as the aftertaste; every infusion of tea soup is of a different style in the aspects of aroma, savor and soup color; and even as for the last infusion, the aroma can still last for long time. The tea sends out sufficient aroma, has a long-lasting aftertaste, and combines mellowness and sweetness, thus having an attractive charm.