According to Xinhua news agency, the launch was unsuccessful; the reasons are unknown so far. The weather conditions were reportedly perfect for the launch.
The rocket was set to deliver Shijan-18 telecommunication satellite into space.
The first launch of the Changzheng 5 (Long March 5) carrier rocket took place in November 2016.
China's largest ever rocket has a maximum payload capacity of 55,116 pounds to a low-Earth orbit.