The nine-second video posted on Twitter appears to show Mary Hastings, a teacher at Ozen High School in Beaumont, striking a student five times while yelling at him about a disruption, calling him an "idiot ass." It was not clear exactly what preceded the action.
Hastings then appears to mock the student's crying following the repeated hits.
She was arrested on one charge of assault and released on bail, according to the Jefferson County Sheriff's Office.
The school said it placed her on administrative leave, and the school district said in a statement that they do not condone and won't tolerate employees abusing a child.
Hastings could not immediately be reached for comment.