Child abuse in China?

Yes. While child abuse exists anywhere in this world, China is not an exception (probably worse than many other places).
Supported by traditional morality --- the very "strict" way to raise children is well accepted by Chinese people for thousands years long --- child abuse had been not an issue for Chinese people at all until recent couple of decades. By Confucianism --- the most important traditional philosophy that governed Chinese ideology for over 2 thousands years, parents were absolutely power over children and children have inescapable filial responsible to obey their parents. "Obeying to parents" had been absolutely #1 moral credit for Chinese people. It is not exaggerated to say that the whole Chinese traditional ethic is based on this "Xiao" principle: unconditionally filial piety. Thus Chinese people learned the obedience since they were born, and the quality of rebellion is very rare among Chinese people.