would like to know what will happen if i mix two different bloods together for eg:-
lizards blood with rats blood
or with human blood.

It depends on what you mix them in. If you are just mixing two different types of blood in a vial or a petri dish, then nothing much will happen. If you mix them together inside an organism, however (if you injected lizard blood into a rat, for example), the 'recipient' immune system would probably react to the 'donor' blood which would either kill the recipient or make it very sick.