Recently my computer desk was destroyed and I can't use it anymore. As I don't have a lot of money to spend for a new one, is there an alternative way to make a new desk using home appliances or any other things?
You said you need a computer desk, but it sounds to me like you just need a generic desk. If I'm wrong please clarify what additional features you need.
To create a makeshift desk, find a flat surface like a board, cabinet door, standard home door, or something similar. Support it with anything that is about the right height like cinder blocks, old milk crates, or even cardboard boxes.
If you have access to basic tools (a saw, hammer, and some nails) you can make a basic desk from discarded wooden pallets (the kind that let a fork lift truck carry a stack of crates). There are many instructables on making things out of pallet wood, but you probably don't even need to go that far -- just a pallet for the top, with the spaces between boards filled in with more boards, and something (milk crates, for instance) to hold it at a usable height.