My skin in leg is very itchy. also when i scratch the dead skin peel off. now my skin is like a snake?

Hard to say: Without seeing your skin. It may be that you have simple dry skin(xerosis). When it gets more severe it can make the skin appear like a snake or cracked porcelain. You may want to try a good emollient(hydrating lotion). But it could be other things like a form of eczema, which may also benefit from a steroid cream. Please consider seeing your doctor for more treatment options.

Ichthyosis vulgaris: Ichthyosis vulgaris is an inherited skin disorder in which dead skin cells accumulate in thick, dry scales on your skin's surface. Symptoms usually worsen or are more pronounced in cold, dry environments and tend to improve or even resolve in warm, humid environments.The experts at the Mayo Clinic suggest using moisturizers with urea or propylene glycol—even simple petroleum jelly. For best results, apply directly after bathing or swimming (Mayo). Using moisturizing, fragrance- and dye-free soaps can also help.