A farmer attacked and injured five primary school children with a hammer in eastern China last Friday before burning himself to death in the latest in a string of horrific assaults on young students, state media reported.

The attacker used a motorcycle to break down a gate of the school in Shandong province's Weifang city, struck a teacher who tried to block him and then used the hammer to attack the children, the official Xinhua News Agency said.

The assailant then grabbed two children before pouring petrol over his body and setting himself on fire.

Xinhua said teachers at the Shangzhuang primary school were able to pull the children away to safety, and none of the injured children had life-threatening injuries.

Xinhua identified the attacker as Wang Yonglai, a local farmer, but had no further details.

China has been reeling from a series of attacks on schoolchildren, with the latest incident coming just a day after a 47-year-old unemployed man rampaged through a kindergarten in Taixing city in Jiangsu province, wounding 29 students aged four or five years old, five of them seriously.

Experts said that a possible copycat rampage had been triggered by similar incidents last Wednesday and last month. They said the wave of school attacks falls amid poor care for the mentally unstable and growing feelings of social injustice in the fast-changing country.

The attacker in Taixing, identified as Xu Yuyuan, pushed his way into a classroom with an eight-inch knife after two teachers and a security guard failed to stop him.