The invention discloses an automatic conveying device of a dispensing machine. The automatic conveying device comprises a conveying platform, wherein battery covers are conveyed on the conveying platform from right to left, at least two storage frames are arranged above the right end of the conveying platform in a left-right parallel manner, the battery covers are vertically overlapped in the storage frames, the storage frames are through up and down, an air cylinder is arranged in front of the right end of the conveying platform and is used for clamping or releasing the battery covers in the storage frames, a top plate is arranged at the middle of the conveying platform, first limit blocks, second limit blocks and third limit blocks are respectively arranged at the left part, the middle and the right part of the top plate, the top plate, the first limit blocks, the second limit blocks and the third limit blocks are driven by corresponding air cylinders to be lifted up and down, an operator only needs to overlap the battery covers in the storage frames, the number of battery covers in the storage frames, falling on the conveying platform in unit time, is controlled by an air cylinder, and three pairs of limit blocks are arranged on the conveying platform and can be used for automatically limiting the conveyed battery covers to ensure that the battery covers fall on specified stations.