Upgrade method and device for data transfer SDK (Software Development Kit)

The invention discloses an upgrade method for a data transfer SDK (Software Development Kit). The upgrade method comprises the following steps: when detecting that a host application calls a data transfer channel, transmitting a network request to a background server, wherein the network request is used for the background server to return a preset plug-in application list, and the preset plug-in application list comprises application information and a downlink address; determining whether a plug-in application for the current data transfer of a user terminal needs to be upgraded according to the application information in the preset plug-in application list; and when determining that the plug-in application for the current data transfer of the user terminal needs to be upgraded, downloading a new plug-in application for the data transfer from the background server to replace the plug-in application for the current data transfer according to the download address in the preset plug-in application list. The inve