Four fire engines and around 25 firefighters were called to caravans alight on Star Lane in Orpington.
Part of two caravans were damaged by fire and a van was destroyed. There were no reports of any injuries.
The Brigade was called at 0029 and the fire was under control by 0131. Fire crews from Orpington, Sidcup, Bromley and Lee Green fire stations attended the scene.
The cause of the fire has been recorded as undetermined.