His words have come as the latest exit polls show that the eurosceptic Five Star Movement is now the single largest party in the election.
Exit polls have also shown that former prime minister Silvio Berlusconi’s centre-right party and his far-right eurosceptic allies, Lega, could emerge as the largest bloc in parliament but fall short of a majority.
Mr Carswell tweeted: “First France and the Front National. Then Germany’s AfD. Now Italy.
“Populists parties on the rampage. Thank goodness our referendum here in the UK on the EU acted as a safety valve.”
Mr Carswell also appeared to ridicule suggestions that Vladimir Putin interfered in the Italian election and in the UK’s decision to leave the EU.
He sarcastically added: “Do you think the Russians did it in Italy too?”
The former Ukip MP is not the first anti-EU political figure to comment on what they consider to be the success of eurosceptic parties in today’s Italian election.
Ex-Ukip leader Nigel Farage offered his congratulations to Italy’s Five Star Movement for their polling results.
He tweeted: “Congratulations to my colleagues in the European Parliament Five Star Movement for topping the poll tonight.”
Mr Farage also retweeted a video posted by the Five Star Movement of its party representatives celebrating a results projection.
Marine Le Pen has also taken to Twitter to taunt the EU ahead of the what she says will be a “terrible evening” for the crumbling Brussels bloc.
The anti–EU former French presidential candidate tweeted: “The European Union is going to have a terrible evening… #Italie #Elezioni2018.”
Italian voters appear to have sent a stern warning to the European Union as the country went to the polls with “disappointment” in Brussels’ establishment continuing to grow.
The recent campaign has been “more populist and more anti-EU” than any other election in Italian history.
Italian paper La Stampa’s columnist Marcello Sorgi wrote: “The March 4 vote yielded a result that Europe was afraid of and Italy perhaps did not expect on this scale.
“Defeated everywhere else in Europe, populism won here. Either it can govern or it will block the system.”