Why my scene view gone black? Need Help....

I think we need more information to go off of. From what I see in the screenshot, however, you may have accidentally changed the Ambient Light color to black.

You can change the Ambient Light settings by going to Edit->Render Settings, then go to the Inspector window and look for the Ambient Light option.

At first everything normal, but when I tried to add animation the scene view suddenly look like that. But in the game view seem normal. I tried your suggestion about Ambient Light but nothing change. Do you have any idea? I'm really stuck here. I also tried to make a new project, but I still got the same problem

What does your animation consist of? Is there anything that could be used to darken the screen, like a black texture, used within your animation?