is it correct to say " i kindly request you to grant me leave"
No-- it is the person to whom you are speaking that is-- hopefully-- kindly:
'I request that you kindly grant me leave.'
Additionally, there's nothing ungrammatical or incorrect about requesting something in a kind manner:Originally Posted by n a hameed
I kindly request. . .
Moreover, the infinitive marker "to" is unecessary:
I kindly request you grant me leave.