The rules, introduced this month by the Welsh Assembly, allow secondary school pupils to appeal against an expulsion without any parental input.
Education Minister Jane Davies said the process would help to protect the rights of "all concerned".
But Geraint Davies, Welsh secretary of union NASUWT, said the new ruling was redundant.
"Parents and children already have a right of appeal, this is often a long and drawn-out process," he said. "This is clearly not going to work for 11- and 12-year-olds, and any appeal will be done in tandem between child and parent anyway."
According to Welsh Assembly figures, there were 445 permanent exclusions from Welsh schools in 2000-2001.
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