Potato tuber is known as a nutritious food because of its rich in protein, dietary fiber, vitamins and minerals the human body needs. Potato flour is a kind of granular or powder product made by potato tuber through multiple processes and retains the nutrients and flavor of potatoes to the greatest extent and is easier to store and transportation. Therefore, it has become an important product in potato deep processing industry. In this paper, the classification, characteristics and processing technologies of potato flour are briefly introduced and the key technologies such as the selection of raw materials, peeling, color protection, cooking, drying and reduction of cell damage rate are discussed. The recommendations on promoting production of high-quality potato flour are put forward aiming to boost the healthy and sustainable development of potato flour processing industry and accelerate the strategy of using potato as the main food source.