The city’s Department of Education is letting student violence get out of hand, according to a Brooklyn federal-court suit.

In the first class-action case filed against the DOE over violence, parents argue that administrators, teachers and security staff aren’t adequately handling constant bullying and beat-downs.

With the worst violence taking place at largely minority schools, the parents argue that their 14th Amendment equal-protection rights are being violated, according to the suit.

School staffers fail to investigate incidents and go easy on abusive teachers, according to court papers.

“A school in New York City is seven times more likely than a school in other parts of New York state to be persistently dangerous,” the suit states.

The legal offensive, which names Schools Chancellor Carmen Fariña as a defendant, is backed by the powerful charter-school lobbying group Families for Excellent Schools.

The suit lists 11 anonymous victims of school violence, their parents and grandparents as plaintiffs.

Parents of student plaintiffs will gather in front of DOE headquarters Thursday morning to formally announce the filing of the class-action suit and detail the abuse their kids allegedly have suffered in city schools.