The National Health Commission said in a statement that 38 of the new confirmed cases were locally transmitted, with 36 of them in Beijing.
This is the highest daily infection count for China’s capital since authorities started releasing data.
Beijing recorded a jump in new confirmed cases, up from six a day earlier, after it started doing mass-testing at the Xinfadi market in the city’s southwestern Fengtai district.
The district has put itself on a “wartime” footing and the capital banned tourism and sports events on Saturday, sparking fears of a new wave of COVID-19.
Nineteen of the new confirmed cases were so-called imported cases involving travelers from overseas, with 17 of them arriving in Guangdong.
China also reported nine asymptomatic cases, one new suspected case and no new deaths from COVID-19 for June 13.
The total number of COVID-19 cases in mainland China now stands at 83,132, while the death toll remained unchanged at 4,634.
China does not count asymptomatic patients, who are infected with the virus but do not display symptoms, as confirmed cases.