The invention provides a method for preparing starch powdered oil and fat by an ultrahigh pressure micro-jet method to solve the problems that the conventional process for producing microencapsulated powdered oil and fat is complex, production cost is high, and a large amount of food additives are needed to be added during production. The method comprises the following specific steps of: preparing emulsified liquid by using oil and deionized water, adding starch into the emulsified liquid, stirring and mixing to prepare suspension, performing pregelatinization on starch, cooling, performing ultrahigh pressure micro-jet homogenizing, and spray-drying. The content of the prepared powdered oil and fat and product granularity can be adjusted, the production process is simple and production cost is low, food additives are not used during preparation, and the product has high safety.