The incident occurred at the Youngor Wildlife Park in the city of Ningbo, about 200km south of Shanghai, according to media reports which added that one tiger in the enclosure was shot dead as a result.
Video emerged online showing a tiger mauling a man in black clothing as visitors screamed in horror and two other tigers stood close by watching.
The tigers were eventually driven away by park staff using with firecrackers and water cannon, said a report in the Beijing Youth Daily, which added that the man was rushed to hospital but later died.
The reports said it was not clear how or why the man, whose wife and child had come to the park with him, had got into the tiger enclosure.
In July last year a woman who got out of her car at Badaling Wildlife World in Beijing was attacked and dragged away by a tiger.
Her husband leapt out of the car in pursuit, as did her mother. The mother tried to hit the beast but was attacked by two other tigers and mauled to death.