The module is the second of three launched so far as Beijing hopes to complete its space station by the end of the year.
China has launched the second of the three main modules that will make up its planned space station, bringing Beijing a step closer to meeting the ambitious goal of having the orbiting outpost fully operational by the end of the year.
The 23-tonne laboratory module – called Wentian, which means “quest for the heavens” – was carried into space by China’s most powerful rocket, the Long March 5B, following a 2:22pm (6:22 GMT) launch aired live on the state broadcaster CCTV on Sunday.
The rocket took off from the Wenchang Space Launch Center on the southern island of Hainan, with CCTV reporting 30 minutes later that the launch was “a complete success”.
The lift-off comes after Beijing sent into orbit the first module of its space station in April 2021.
The new module, about 18 metres (60 feet) long, will still need to dock with the module already in space.
If that is successful, the third and final module is scheduled to launch in October, with officials hoping the space station – named Tiangong, which means “heavenly palace” – will be operational by the end of the year.
China’s plans for its heavily promoted “space dream”, which seeks to catch up with the United States and Russia, have been put into overdrive under President Xi Jinping.
The space station’s completion is set to coincide with the Chinese leader marking 10 years in power.
China has been excluded from the International Space Station since 2011, when the US banned NASA, one of five space agencies participating in the project, from engaging with the country.
The module launched on Sunday has three sleeping areas, as well as a space for scientific experiments. It will serve as the main exit-entry point for extravehicular activities when the station is completed.
The launch was unmanned, although three Chinese taikonauts are currently on board the already orbiting portion of the space station.