Rhys Williams was approaching the port in the lawless French town in the early hours when his Mercedes' windows were shattered by a gang of asylum seekers from the sprawling Jungle camp.
He told how a mob of migrants ran onto the road brandishing chainsaws and throwing Molotov cocktails at the police and passing traffic in scenes that "resembled a war zone".
The 53-year-old, who is an operations manager for the Road Haulage Association (RHA), was left covered in glass after his front and back door windows were shattered.
The attack is the latest in a string of incidents where migrants have attacked cars in a bid to block roads and break into lorries bound for Britain.
And it is the second time eyewitnesses have reported migrants using chainsaws during raids on the motorway amid fears they are becoming increasingly violent in their attempts to reach the UK.
Mr Williams said: "I was on the pitch black approach road to the port at about 1am in the morning when there was an almighty bang to the side of my car.
"Two or three migrants had thrown a massive boulder that smashed my windows and damaged the rear door, driver's door and the pillar in-between.
"Two police vans were trying to contain 50 to 60 migrants that had come onto the carriageway with chainsaws and Molotov cocktails, throwing them at the trucks, the traffic and the police.
"They were chopping down trees and setting fire to them to block the road, there was no way the police could cope.
"In the middle of all this was a small family car, the occupants were clearly distressed.
"It was something that I can only imagine would resemble a war zone."
Mr Williams, from Bicester in Oxfordshire, said the incident earlier this month should be a warning to holidaymakers heading through the port.
He said: "They used to target the trucks but now it has taken another slant, no vehicle is safe, they are doing anything they can to stop the traffic so they can climb into stationary trucks.
"I don't want to scare people but with the next two weeks being peak holiday season there will be a lot of people making their way to Calais, it's really not a place families should be travelling through.
"I was covered in glass in my car, I dread to think what could have happened if there was a child in the back.
"My car is still in the body shop, the cost of repair will be £2000 to £3000 plus the cost of a hire car.
"Unless the authorities do something soon someone will be killed, that's not scaremongering, it could be a lorry driver or a holidaymaker.
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