Disclosed are a method and device for a proxy access of an open platform for solving technical problems that resource occupancy is excessive, a password security is low, and a local file cannot be uploaded. In the present invention, an official application is established in a user terminal, and the official application interacts with the open platform by an SDK provided by the open platform; the official platform is bound by applying for a protocol with the URL format from an operating system of the user terminal, and provides an interaction interface for the third party application through the protocol with the URL format. Therefore, the present invention reduces the system resource which the third party application occupies in the user terminal and the development cost of the third party application, and protects the security of the user's account.