Is Transit visa needed for a srilanka passport holder

I am a 24 year old male , working in Auckland with a 2 years of work entry permit NZ, I am travelling to Sri Lanka in December has a transit of 10 -11 hours in Guangzhou air port in China . Do I need to get a transit visa if I am not going outside the airport and it’s less than 24 hours and hold the ticket for the 3 rd country? Thanks