The report, presented to the public Wednesday, was handed to the Australian government in November 2014, according to media reports.
In the 15-month period studied, the report also suggested that 33 children were sexually assaulted and 27 voluntarily went on hunger strike protesting against detention conditions, and more than 200 were involved in some form of assault.
At least 12 children were born in immigrant centers which means they may be denied the right to nationality and state protection.
The report recommended releasing all the detained children and their families to local communities with a right for their parents to work.
Other recommendations envisage adopting legislation ensuring undocumented immigrant children should only be detained for health, identity and security checks. Further incidents should be prevented by establishing cameras in every detention center, the study suggests.
The total number of asylum-seekers in Australian immigrant centers is over 5,500. Over 1,000 of those are children, according to the report.