The inspectors are monitoring the production process and sanitation, while also carefully checking product quality, the China Daily reported.
"Our responsibility is to maintain a 24-hour vigil on production... I haven't been home for months," the paper quoted Liu Yinghong, an inspector at a surburban Beijing factory, as saying.
"No product can leave the factory without our ratification."
Earlier this year, China's quality watchdog pledged safe food for the Beijing Olympics, addressing concerns arising from a string of quality scandals over items produced in the country.
"(We will) carry out strict inspection and quarantine of food items prior to and during the Olympic Games," Pu Changcheng, vice minister of the General Administration of Quality Supervision and Inspection and Quarantine, told journalists earlier this year.
"All the products must obtain a quality safety label before they are allowed to be delivered to the Olympic Games," he said.
Chinese-made products, ranging from seafood to car tyres to toys, were at the centre of a series of global safety scandals and recalls last year.
Beijing then launched a crackdown on shoddy products.