The sentence is from a novel 'Life of Pi', and here is the part.
Still, answer the question, any regrets now?
I don't think about it.
The very definition of an animal. That is all you are.
And what are you?
A human being, I will have you know.
Is this sentence similar to 'I will let you know'?
Best Answer
A meaning of have is to compel, be obligated to do/make, or force.
So "I will have you know" is meaning "I am obligated to make you know."
That's what it means literally, but this is a well-known saying that has an underlying meaning as "@Joe Dark" describes perfectly in the comments.