Hi, Is there any luggage/baggage deposit services in Guangzhou airport? How much? Thanks

Yes, there is luggage deposit service in the airport, two in International Hall and one next to the Gate 8 of International Departure Hall.
The price depends on the size of the luggage. For small one, it is 5RMB per piece, 10RMB for middle size and 20RMB for large size. If you want to store valuable, the price is 3RMB per piece.