"The plan for a new airport has been approved by the State Council," Beijing airport spokesman Li Shengbo said on Sunday.
He declined to give further details, such as when construction will start and what the new airport will look like, as "this is still under discussion".
Zhong Ning, a spokeswoman for the Civil Aviation Administration of China, declined to comment on Sunday.
According to CAAC News, a newspaper affiliated with the aviation administration, large-scale construction will commence next year, and the airport is scheduled to open before the end of 2018.
The airport will be located near the border between
Beijing's southern suburban Daxing district and Hebei province.
It will cost at least 70 billion yuan ($11.2 billion) and have six runways for civil use and one for military use, CAAC News reported, quoting Zhu Wenxin, who works in the office in charge of construction.
The airport will be able to handle 70 million passenger trips annually by 2025, Zhu was quoted as saying.
A rail line will be built to connect the airport with the city center, according to a plan approved by the National Development and Reform Commission.
Passengers will be able to reach the airport within 30 minutes from Beijing South Railway Station with trains running on the 37-kilometer line.
Increasing flight numbers have affected punctuality at Beijing airport, according to media reports.