The move comes after workers at the world’s biggest iPhone factory battled police over pay and lockdown conditions.
The country has reported record high infections and in response has imposed restrictions as it continues to battle the virus.
The state owned CGTN network reports that cities including Beijing are going back into lockdown.
Schools, restaurants, gyms, beauty salons, and other facilities have been closed this week, says CGTN.
The resurgence of infections comes nearly three years after the pandemic emerged in the central city of Wuhan.
The curbs are taking a toll on locked-down residents as well as output at factories
They include the world’s biggest iPhone plant, which has been rocked by clashes between workers and security personnel in a rare show of dissent.
It comes as hundreds of workers took to the streets around the vast factory in Zhengzhou confronting hazmat-clad personnel wielding batons in a rare display of public anger in China.
In the wake of the unrest, Zhengzhou authorities ordered mass testing and an effective lockdown for several districts in the central Chinese city starting Friday.
City centre residents cannot leave the area unless they have a negative Covid test and permission from local authorities, and are advised not to leave their homes “unless necessary”.
The restrictions will affect more than six million people but do not cover the iPhone factory, where workers have already been under Covid restrictions for weeks.