Disclosed are a user interface processing method and device. The method is applied to a user terminal which is configured to execute a game client, the game client comprises a first thread and a second thread, and the second thread is pre-packaged in a browser kernel of the game client, and the method includes: obtaining, by the first thread, a user interface rendering event which is to be processed: obtaining by the second thread, a to-be-rendered object corresponding to the user interface rendering event; rendering, by the second thread, the to-be-rendered object, and sending a rendering result to the first thread through a first interface, wherein the first interface is an interface provided by the second thread for storing the rendering result; and presenting, by the first thread, the rendering result.