Card reading and writing method, system and device based on cloud service

The invention provides a card reading and writing method based on cloud service, which can be applied to the field of finance. The method comprises the following steps: receiving an operation request from a client through a cloud server, wherein the operation request comprises a card reading request and a card writing request; the cloud server sends the operation request to a target card reader through a communication channel, and the target card reader is in communication connection with the cloud server through a wireless network; and the target card reader processes a target card according to the operation request. According to the card reading and writing method, the cloud server is added, so that the target card reader can realize wireless interaction with the cloud server, the target card reader does not depend on a plug-in of a browser any more, the development step of the plug-in of the browser and the security setting step of the browser are omitted, the development cost and time are saved, and meanw