Islamic State jihadis have taken murderous depravity to a new low — forcing a child to behead a Syrian army officer.

The extremist thugs have increasingly turned to their so-called “cubs of the Caliphate” as loathsome propaganda tools to carry out their vile deeds.

A boy no older than 10 is seen on video appearing to decapitate the officer, who is believed to have been a commander in the ancient city of Palmyra, the Daily Mail reported.

The execution is thought to have been carried out at the Western Hir Palace in the province of Homs after the doomed man was snagged at the Al-Bosayri army checkpoint, the paper reported.

The steely-eyed boy, clad in camouflage and a black headdress, approaches the man, pulls his head up and slices his throat. He then lifts the severed head in grotesque glee and puts it on the man’s back.

As the video ends, an older militant spews a threat at the camera: “Our goal is not only Palmyra or Homs or Damascus, rather our goal is to conquer Bayt al-Maqdes [Jerusalem] and Rome, God willing,” according to the UK-based Syrian Observatory for Human Rights, the Daily Mail reported.

Islamic State has used kids to kill before, but the latest video is believed to be the first that appears to show a young boy carrying out a beheading.