The guards and workers of the children Sala managed to stop 39-year-old intruder, after which she was detained arrived on the scene the law enforcement officers.
Video footage released by the Chongqing Broadcasting Group seems to show police dragging the woman away while young children, some of whom appeared to have cuts to their faces, were taken away on stretchers by medical staff.
No other information about the attacker was given, other than her surname, Liu.
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Police said the attack at the Xinshiji Kindergarten in the city's outskirts took place at 9:30 a.m.as the children were returning to classes.
The injured were rushed to a nearby hospital for treatment.
In another incident previous year, a man climbed the wall of a kindergarten and knifed 11 children.
Police are now investigating and no motive has been given for the attack.
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Such attacks are often blamed on people with mental illness or who have personal grievances.
Friday's incident isn't the first time school children in China have been hurt by people wielding knives.
In April of this year, a 28-year-old man killed nine middle school students, claiming later that he had been bullied in school.
A spate of killings of school children in 2010 prompted a response from top government officials and leading many schools to add gates and security guards.
China, Japan vow to forge closer ties at ‘historic turning point’
Editor's note: When then Japanese Prime Minister Tanaka Kakuei visited China in Sept 1972, China donated a pair of pandas to Japan.