Can a business class ticket transfer overnight in Shenzhen?

yes. Business class tickets can be transferred overnight in Shenzhen. The plane stopover is to rest at the airport, which is not arranged in general, but may be arranged in special circumstances, such as the service purchased by customers including accommodation. If it is the airline's fault, the airline will arrange accommodation if it fails to catch the plane of the day. If you book your own flight, you need to spend the night in the middle, and you choose to spend the night at the airport.