I think they both mean you need a new wife!

My wife hits me could mean that she hits you one time and not very hard. My wife beats me would mean that she hits you many times very hard and causes damage. Being hit can be mild. Being beaten implies something more severe.

Flea from your wife.

beat是反复打，比如心跳也可以用beat，打鼓也可以。战斗战败也可以用beaten。但是如果是毒打，类似奴隶主打奴隶，肯定就是反复打，也用这个。 hit是重力一击，或者有意无意的撞击之类。击中也用这个。比如石头击中目标，或者地震袭击某地。打耳光也可以用hit。 还有一个strike，这个是用武器，比如木棒之类的打击O(∩_∩)O~ 所以看打的程度了。 I wish the explanation will help you.

I think they are about the same, and they are both OK. I think we might more commonly say "My wife abuses me" or "My wife is abusive toward me."