I am traveling from Guangzhou to Abu Dhabi via Qatar, what's the maximum luggage weight I can check in?

In general, 30kg can be checked in for international flights for business class passengers. For economy class travlers, only about 20kg can be taken for the flights.
To be honest, different airline companies have different policy for the luggage, so it is suggested to ask the airline company directly in order to make sure the luggage problem.