China's historical "wife killing culture" exists or not?

There is.

While the Han culture has a saying that "human life is of paramount importance", in reality it has not established the belief that "human life is sacred and inviolable", and that human life is not valuable, but rather social status and position. In Chinese history, whenever there were times of turmoil and war, the tragedy of human bones being used as firewood and human flesh being cooked occurred from time to time. In Chinese history, there is even a saying of "two-legged sheep", that is, when marching and fighting, human beings were used as military food and were killed and eaten anytime, anywhere. Understanding of such a cultural background, we will kill the wife of this thing in Chinese history often appear, will not feel very strange.