I have two independent networks one is LAN network over Mikrotik router and another is wifi network over belkin router. Both are having independent internet connection. I want to make bridge between to networks( e.g, server in the LAN would be accessible for Wi-Fi user). How do I do it?

Depends on how much can be set in belkin. If it is at one place use mikrotik only with some kind of dual wan scenarios. No need for feeding belkin furthermore.