The Perseus missile will be the most sophisticated weapon in its class travelling at Mach 3 or 2,000 miles an hour, three times the speed of existing weapons.
In midflight it can deploy a further two baby missiles that can help it straddle a ship with devastating firepower or seek out extra targets or confuse surface-to-air missile batteries.
One engineer on the project unveiled at the Paris Air Show, said: "This is the stealth bomber of missiles and can penetrate enemy defences like nothing else."
The £800,000 Perseus, designed to replace the existing Exocet and Storm Shadow weapons, will be invisible to radars until the very last few seconds before the two ton weapon impacts.