Six boats with 183 migrants on board reached the UK after crossing the English Channel on Tuesday.
The figure is the highest daily number so far this year, and is just under the total in the whole of March 2020 when 187 people made the crossing.
French authorities stopped about 50 people from attempting the crossing, a Home Office spokesman said.
The government is planning to make it more difficult for asylum seekers to stay in the UK if they come illegally.
About 850 people have made the crossing so far this year, compared to 338 in the same period in 2020.
More than 8,438 people crossed the English Channel in about 635 boats in 2020.
Under new plans being set out by the government, people seeking protection as refugees will have their claim assessed based on how they arrive in the UK.
Under the plans, people who enter the UK illegally to claim asylum will no longer have the same entitlements as those who arrive legally.
Home Secretary Priti Patel
says the new system will be "fairer" and will crack down on criminal gangs.
Campaigners say the proposals would create an unfair system and would not address people smuggling.