British police are to work with French officers and the UK Border Force at a new “command and control centre” in Calais, the government has announced.
The centre will target the criminals who try to smuggle migrants into northern France and across the Channel, the Home Office said.
It will be led by two senior officers, one English and one French, who will each report to their own government.
The Home Office said the arrangement would enable greater collaboration.
The new centre is part of a deal between the UK and France to co-operate over the ongoing problem of illegal migration.
The deal will be signed by Home Secretary Theresa May and French Interior Minister Bernard Cazenueve in Calais later.
The two countries will work together to dismantle smuggling networks and prosecute those responsible, the Home Office said.
Other measures in the deal include extra French policing units, improved fencing around the Eurotunnel entrance and stronger security in the tunnel itself.
The UK government has already spent £7m on new fencing in and around Calais, but details of the latest deal have not yet been released.
The situation in Calais is part of a much larger migration issue in Europe.
More than 240,000 migrants have crossed the Mediterranean already this year, arriving on the shores of Greece and Italy.