First, clean shelled peanuts are crashed then the crashed shelled peanuts are rolled into peanut embryo pieces that are sent into a flat plate drying machine to be roasted indirect steam or conduction oil is adopted as heat source, roasting temperature is controlled between 230-280 DEG C, roasting time is controlled for 30-50mins, roasting pressure is controlled in 0.3-0.5MPa the roasted peanut embryo pieces are taken out from the flat plate drying machine to be squeezed by a machine, and refined so as to obtain peanut oil. By adopting the preparation method for the superfine fragrant peanut oil, the production process has the advantages of little heat energy loss and saving energy and reducing consumption since roasting temperature is controlled around 250 DEG C, which not only is in favor of material denaturation, but also facilitates being fully cooked and causes no charring. The production technology can produce peanut oil with superfine fragrant, sparing tastes of raw peanut and charring as well as bright and translucent color and good taste.