The controversial announcement came after a PhD thesis documented that Arabic-speaking pupils at two schools with many bilingual children used their native tongue to insult students and teachers who could not understand what was said.
"If you live in Denmark, you should speak Danish," the Danish People's Party spokesman Martin Henriksen told Danish Radio. "We're going after Arabic because that's where the problem lies," Henriksen said.
At the same time, Henriksen admitted that his party's hypothetical black list may grow to include languages such as Turkish.
"From what I hear, this is unfortunately a problem among students with Muslim backgrounds," Henriksen said, stressing that languages like French or German apparently did not pose any problem.
The Danish People's Party's was dismissed by the Socialist People's Party as "totally crazy and absolutely frivolous."
"There are schools in Copenhagen where more than half of the students have an immigrant background, so this will not stand," Jakob Mark of the Socialist People's Party said.
Anders Bondo Christens, the head of the Danish Teachers' Union, said the very idea of banning languages was a clear violation of the freedom of speech.
"I adhere to the opinion that there are some values that our society is built upon: such as the freedom of speech, gender equality and democracy; and those cannot be questioned," Christens told the tabloid newspaper Extra Bladet.
Last June, the Danish People's Party notoriously proposed a tax on the use of English in commercials and previously advocated the strict use of Denmark for public purposes.
Recently, the Danish People's Party also made local headlines for suggesting that people on unemployment benefits should be tasked with cleaning school toilets after numerous complaints about poor hygiene.