In the STO Express building in Liny, Shandong Province, the 300 robots can get through 20,000 parcels every hour.
The self-charging workers have saved the company, which has 300,000 employees, a staggering 70 per cent of manpower.
They began operating in November last year at two of the company’s warehouses.
The robots can identify the destination of a parcel through a code scan – practically eliminating mistakes.
Once fully charged they can work eight hours flat out.
A spokesman from HIKVISION told MailOnline: “It would take workers five hours to sort the same number of parcels the robots sort in three hours.
‘”In addition, workers might make mistakes, handle parcels violently or become stressed and tired under high pressure.”
The machines were developed by Chinese digital technology company HIKVISION.