The horrifying images emerged at the same time as the increasingly-besieged terror group shared pictures of its 'softer side' - showing militants handing out advice on giving to charity during Ramadan.
And it is not the only vile 'execution' to happen in recent days: another series shows a man's head sawn off with a knife. His supposed crime was 'pledging allegiance to the infidels'.
The pictures from the Raqqa murder shows a man sitting on a chair in a town square, surrounded by a crowd of men and boys, some who appear to be little older than seven or eight.
The bespectacled executioner - who bares more than a passing resemblance to The Bulldozer, the obese killer captured by the Syrian army last month - is seen wielding the massive weapon, apparently taking off the man's head in one sweep.
In one picture, members of the crowd seem to be smiling as the medieval punishment is carried out.