The invention discloses an online payment device with visible light and barcode bidirectional authentication. The online payment device comprises an electronic wallet, a prepaid consumption machine and a server, and is characterized in that the electronic wallet comprises a visible light transmitting module, a barcode scanning module, a wallet control module, an input module, a display module and a data interface; the prepaid consumption machine comprises a visible light receiving module, a barcode display module, a read-write control module, a keyboard module, a display and a communication module; the server gives out authority to the prepaid consumption machine and the electronic wallet, and once payment is accomplished by a payee repaid consumption machine, a payer electronic wallet and the server together; and data interface between the prepaid consumption machine and the electronic wallet is integrated in the visible light and barcode, and information verification in the transaction process is mainly completed by the server. The online payment device realizes a novel all-in-one transaction mode in which intelligent mobiles phones and tablet computers equipped with a flashlight and a camera can also be used as a payment tool.