When i render my animation i can see only white screen in both eevee and cycles
There may be a lot of different reasons for such result.
By default, world is grey with a strength set to 1. If you set a very high value of strength of its emission, it might become white.
Modification of color management may give same kind of issue.
White background may be wanted but issue may be absence of scene. Objects of scene may be disabled for rendering process, but visible in viewport.
There may be an issue at compositing about mixing background and objects of scene.
You have to give more information about your file.
What does your scene look like ? What did you try to achieve ? Is a simple render as problematic ?
Try disabling all objects in the scene and testing them.
This will see if it’s a scene problem or something else.
I think we need to find it by removing the cause of the estimation like this.
That might be the issue if Image Editor window is not closed between renders.
But during render the watch should be visible.
A problematic compositing set-up or VSE use should also show watch during render, before replacing it by a white image.
But objects seems to be visible on render. At least, renderability is not the issue.
Indeed, it looks like a post-processing issue.