Fever for 14 day without any other symptoms CBC show leukopenia also high ESR & CRP. Take all antibiotics and no response. What is the diagnosis?

FUO. Fever of unknown origin. Please read up on this term. There's a good chance that you are seriously sick, and in need of a proper workup in real life -- we can't do it here based on the very incomplete information you've provided. You have Hodgkin's, TB or bacterial endocarditis until proved otherwise; there are dozens of others to rule in/out.