The vaccine, one of two main Chinese shots that collectively have already been given to hundreds of millions of people in China and abroad, becomes the first COVID-19 shot developed by a non-Western country to win the WHO's backing.
It is also the first time the WHO has given emergency use approval to any Chinese vaccine for any infectious disease.
A WHO emergency listing is a signal to national regulators on a product's safety and efficacy, and would allow the shot to be included in COVAX, the global program to provide vaccines mainly for poor countries.
The WHO has previously given emergency approval to COVID-19 vaccines developed by Pfizer-BioNTech, AstraZeneca, Johnson & Johnson, and, last week, Moderna.