They make up the 200-million-strong workforce in the nation's manufacturing heartlands and have been known for decades for their diligence, tolerance and plain living.
So why are the migrant workers on the mainland still so poor after close to three decades of double-digit economic growth?
Chen Xingping, a 45-year-old cleaner from Sichuan who earns 1,200 yuan (HK$1,375) a month mopping the marble floors of a Shenzhen department store frequented by the city's Prada-wearing elite, says he doesn't have an answer to that question.
Mainland sociologists blame unreasonably low statutory minimum wages and heavy taxation that offer little in the way of social welfare protection.
Chen and his wife have worked as cleaners at the department store for two years. They are both paid 1,200 yuan a month and do not have medical insurance or a pension scheme.
They can't afford to rent private accommodation so the company deducts 50 yuan from each of their salaries each month for two tiny berths in a cramped dormitory shared by 11 others.