The invention discloses linseed oil and linseed gum vegetable fat powder and a preparation method thereof. According to the vegetable fat powder, soy protein isolate (SPI) and maltodextrin (MD) are used as wall materials, linseed oil is used as a core material, linseed gum is used as an emulsifying agent, and a spray drying technology and a microcapsule technique are adopted, so that the vegetable fat powder is prepared. Compared with traditional vegetable fat powder using hydrogenated vegetable oil as a raw material, the vegetable fat powder prepared by the preparation method disclosed by the invention does not contain trans-fatty acid, so that the danger of the trans-fatty acid is greatly reduced; besides, the vegetable fat powder disclosed by the invention also has various health-care functions of preventing thrombosis, reducing blood lipid, regulating immunity, restraining cancer and the like; in addition, the microcapsule preparation technique is adopted, and liquid fat is converted into powdery solid, so that the fat oxidation risk is greatly reduced, the fat stability is strengthened, the storage period of the product is prolonged, and the special smell of the linseed oil is also concealed; and the vegetable fat powder has multiple advantages of being simple in technology, low in cost, easy to control and store, high in stability, high in water solubility and the like.