The invention discloses a cash dispensing method of financial self-service equipment, which comprises the steps of: by a general solving method of directly solving an integral solution of an n-element first-order equation, obtaining the general solving method of the integral solution of the n-element first-order equation; depending on a principle that the dispensing amounts of various values must be greater than zero and less than rest available cash amounts of the values in the self-service equipment, solving a limiting range of free factors in the general solving formula, therefore, all cash dispensing solutions are rapidly obtained; and lastly, depending on a cash dispensing rule of the self-service equipment system, obtaining an optimal cash dispensing solution. The cash dispensing method is direct, efficient, rapid and precise, and is capable of finding out all cash dispensing solutions rapidly without using an exhaust algorithm, therefore, the solution has the advantages of short cash dispensing time, high cash dispensing efficiency and the like.