Director-General Tedros Adhanom Ghebreyesus said the steps China took to fight the virus at its epicentre were a good way of stopping its spread.
The praise comes as Chinese officials have been widely criticised for their initial handling of the outbreak.
On Tuesday alone, nearly 4,000 new cases were confirmed in the country.
The death toll has now risen to 490, an increase of 65 deaths in mainland China in one day, the latest figures from the country's National Health Commission said. All the new fatalities were in Hubei province, the centre of the outbreak.
In China alone, there are now more than 24,300 cases, with a much smaller number of cases in other countries around the globe.
Two people have died of the disease outside of mainland China - one in Hong Kong and one in the Philippines.
The WHO has declared a global health emergency over the outbreak but said it did not yet constitute a "pandemic", or the worldwide spread of a new disease.
About 80% of those who died were over the age of 60, and 75% of them had pre-existing health conditions such as cardiovascular diseases and diabetes, according to China's National Health Commission (NHC).
The new coronavirus causes severe acute respiratory infection and symptoms usually start with a fever, followed by a dry cough. Most people infected are likely to fully recover - just as they would from a flu.