First of all: Has your wife always been like this, or has it started recently? And does she get angry just with you, or with things and people in general?

If this has started lately, you need to have a talk about what's wrong. And especially if she seems to be annoyed mainly with you, you need to find out why. When that is clear you can both start looking for a solution.

However, if your wife just seems to be an angry person, things may be more serious. I think you still need to talk, but in a different way. You could tell her that her anger is making life difficult for you (people who lose their temper easily often have no idea what effect this has on other people). Do try not to get angry yourself, as this makes it much harder to find a solution. If she can't deal with her anger and you are really finding it hard to live with, you could think about anger management - start with these tips and explore the links for further information if you need it. Good luck!