The invention discloses edible blend oil and its preparation method. The edible blend oil is prepared from, by weight, 20-30 parts of corn oil, 20-30g of soybean oil, 10-20 parts of rice oil, 10-20 parts of flaxseed oil, 5-10 parts of peanut oil, 1-2 parts of Vitamin E, 0.5-1 part of hydrolysis plant protein, and 0.5-1 part of green tea extractive. The raw material further comprises lycopene, citric acid and medlar extractive. The edible blend oil is high in nutrition value and good in oxidization stability; after eating for a long time, the edible blend oil has good effect to people with hyperlipidemia, high blood pressure and hyperglycemia, patients with cardia-cerebrovascular disease, fatty liver and obesity.