The invention discloses novel plant blend oil and a preparation method thereof. The novel plant blend oil comprises 92-99.3 parts of high oleic acid peanut oil, 0.7-8 parts of linseed oil, 0.2-0.5 part of vitamin E, 0.3-0.6 part of phytosterol esters and 0.002-12 parts of conjugated linoleic acid glycerides. According to the novel plant blend oil disclosed by the invention, the high oleic acid peanut oil is used as a main raw material, the linseed oil and the like are added for blending, and the blend oil which can better meet requirements of human bodies and is good in omega 6/omega 3 ratio is obtained; the novel plant blend oil is balanced in nutrients; the compounded raw materials and resveratrol in the high oleic acid peanut oil are in coordination and synergism, so that the shelf life of the blend oil can be significantly prolonged; and the high oleic acid peanut oil is obtained through extruding oil from peanut roots and peanuts, has higher resveratrol content and higher oleic acid content, is more convenient and environmentally-friendly in preparation means and method than those in the prior art, and has no chemical solubilizers.