According to the police, Muthappa, the accused teacher at Adarsh Primary School beat the boy with a shovel.
The victim-Bharat-was a student of Class 4.
The police said the reason behind such brutal thrashing is not yet apparent and prima facie it appears to be a family issue.
Muthappa had even thrashed Bharat's mother, Gita Barker, who is a teacher at the same school. She is receiving treatment at a local hospital.
The accused, who was a contractual employee, is currently missing.
A similar incident was reported at a school in Delhi last week. The teacher, in a fit of rage, had attacked a student of Class 5 with scissors and flung her from the first floor of a government school building.