An alarming rise in abusive parents in South Australian schools has prompted tough new laws.

Under the legislation, which takes effect today, parents can be banned from school grounds for up to six months and face hefty fines, as principals push back on violence, threats and online abuse.

The frequency of parental bans in the state's schools has increased by 200 per cent over the past five years as principals deal with rising levels of abusive incidents.

"It is something sometimes that it's necessary," North Prospect Primary principal Russell Barwell said.

"It allows us to remove emotion from the situation."

Recent data indicates a marked rise in formal warnings issued to parents by public schools, with 206 letters sent this year, compared to 61 five years ago, while 107 b

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