The invention provides an information interaction method and device supporting multi-party collaborative operation, a server and a platform, and the method comprises the steps: receiving an account and a password inputted by login of a first terminal, building communication with the first terminal, and pushing platform information to the first terminal; responding to a first request initiated by afirst terminal, responding to a second request initiated by a second terminal and verification information of the second request, and enabling the second request to join the created action task; in response to a data uploading request and data source registration information initiated by the first terminal or the second terminal, allocating a uniquely identified data stream ID to the terminal, and uploading or downloading related data according to the data stream ID. Compared with the prior art, after the account and the password of the terminal are received, the unique data flow ID is configured according to the data source list information when the terminal is registered, and the corresponding data uploading channel of the data forwarding server is configured according to the data flowID, so that the data uploading and downloading speed is increased.