31 July 2015 Last updated at 07:55 BST
Many of these people are living in a makeshift camp in Calais known as "The Jungle".
They have tried to make the camp as liveable as possible - constructing shelters, a school and a community canteen.
Martin has been to the French town to find out more the growing migrant crisis there.
The British and French governments are coming under increasing pressure to deal with the migrant crisis in Calais, France, from where thousands of people have tried to enter the Channel Tunnel in an attempt to get to the UK.