Six bodies were found when the firefighters searched the building after the fire was extinguished. Seven workers were injured in the incident, state-run Xinhua news agency reported.
A total of 26 fire engines and 140 firefighters took part in the operation to douse the fire.
Earlier, media reports said that one worker, who jumped off the roof of the burning building, was killed. Many others remained trapped inside the building.
He said the flames were put out at 4 PM and four persons were hospitalised.
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Witnesses said they heard explosions before the fire.
Photos and videos of the fire was flashed all over Chinese social media. Earlier, reports said that many others remained trapped by the flames. Screams for help could be heard as workers at the factory building ran to the roof in an effort to escape but got trapped by dense smoke.
A rescue operation was underway.