The blast happened at around 4:50 p.M. At the front gate of the kindergarten in Fengxian County in east China's Jiangsu Province when children were leaving the school, officials were quoted as saying by the state-run Xinhua news agency.
China Global Television Network said that seven people have died and 59 others have been injured in the blast.
Two people were killed at the site of the explosion while five died in hospital.
It was not immediately clear what caused the blast, which rocked the kindergarten as parents were picking up children from the school.
Some victims were seen covered in blood while others appeared to be unconscious and some even with their clothes burned off. Children were seen among the injured.
"Many people could be dead," he said.
In one video clip posted online, a man covered in blood was seen trying to stand up only to collapse again. His clothes appeared to have been burned off.
In a separate video clip, people could be heard shouting: "Blast, blast, dial 110 quickly!"
The gate of the kindergarten appeared to have been horribly bent, with shattered glass littering the scene.
China in the past witnessed knife attacks on kindergarten school children by disgruntled people. An explosion of this magnitude was rare.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)