The attacker, whose motive was not immediately known, has been arrested, CGTN news channel reported.
The condition of three of the children is said to be critical.
All injured have been hospitalised.
In January 2017, a farmer slashed and injured 12 children with a knife at a kindergarten in Youyi town, Pingxiang city. Four children were seriously injured while eight others received minor injuries. The man has been executed.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)