I wanna to make a picture cake at home so anyone tell me how can i make it

You mean with an edible image?

You either have to have a printer that prints edible images or order one.

There are websites you can order from, such as http://www.ediblepictures.net/Pages/CustomEdibleImages.aspx

Or some bakeries will print them for you, I know our Safeway does them for a couple dollars.

http://www.fillyourheartediblememories.com/How-to-apply-edible-images-24.html

Those are really good instructions for applying it.