The invention discloses a grain warehouse-out method and system based on a mobile terminal. The grain warehouse-out method based on a mobile terminal includes the steps: A, generating a delivery advice note of grain and generating a corresponding warehouse-out bar code at the same time, and pasting the warehouse-out bar code on the delivery advice note; B, scanning the warehouse-out bar code on the delivery advice note to obtain the warehouse-out information, and sending the warehouse-out information to the mobile terminal to display; C, according to the stock information, editing the warehouse-out information displayed by the mobile terminal, and storing the edited warehouse-out information; and D, according to the modified warehouse-out information, performing warehouse-out operation. The grain warehouse-out method and system based on a mobile terminal can improve the warehousing and warehouse-out flow of the grain industry; the user can uses a smart phone and other mobile devices to acquire the related data of the warehousing and warehouse-out flow; and by means of the modes, such as automatic generation of receipts, control of remote printing and management of bar code, operation of warehousing and warehouse-out of grain can become more simple and practicable, so that the production efficiency can be further improved and the accuracy can be improved.