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This invention relates to a secure cross-network data transmission device, belonging to the field of data transmission technology, and solves the technical problems of high cost, low efficiency, and insufficient transmission stability and security in existing cross-network data transmission. The solution is: a secure cross-network data transmission device for unidirectional data transmission from an intranet to an extranet, comprising: a rectangular shell; a high-definition display module located on the front inner wall of the shell, used to display generated QR code images in high definition; a data receiving module located inside the shell, used for unidirectional data reception; and an audio module located on one side wall and bottom inside the shell, used to provide sound output. Compared with existing technologies, this invention has advantages such as unidirectional transmission, high security, simple deployment and operation, low cost, high transmission efficiency, strong stability, and high accuracy.