A cash replenishment method for financial self-service equipment. The method comprises: by using a general solution method for directly solving an integral solution of a linear equation with n unknowns, obtaining a general solution formula of the integral solution of the linear equation with n unknowns; then, in accordance with a principle that the cash replenishment amount of each denomination must be greater than zero and less than the number of remaining available banknotes of this denomination in self-service equipment, solving a limiting range of free factors in the general solution formula, so that all cash replenishment solutions are obtained; and lastly, in accordance with a cash replenishment principle of a self-service equipment system, obtaining an optimal cash replenishment solution. The cash replenishment method can find out all cash replenishment solutions without using an exhaustive attack method, and can achieve rapid and highly-efficient cash replenishment.