Speaking today on St George's Day, the Labour leader said the move would bring together England, Scotland, Wales and Northern Ireland, while giving workers a well-deserved break.
Under the proposal, there would be public holidays on St David's Day (March 1st), St Patrick's Day (March 17th), St George's Day (April 30th) and St Andrew's Day (November 30th).
'Seven years of austerity'
Mr Corbyn said: "For years, Britain's workers haven't had a proper pay rise, with wages for most people still below 2007 levels.
"After seven years of painful austerity, our workers deserve a break - and under a Labour government, they will have the opportunity of four more days off a year.
"The four nations that make up our great country have rarely been more divided due to the damaging and divisive policies of this Conservative Government."
Meanwhile, Theresa May is expected to propose slashing energy prices by as much as £100 (€150) for 17 million families in her party's manifesto.
The UK Prime Minister will call for a cap on gas and electricity bills for seven out of 10 households that pay standard variable tariffs.
Allies of Ed Miliband, though, have accused Mrs May of "stealing" his flagship 2015 plan as part of her bid to win seats in Labour's northern heartlands.
UKIP look likely to tack right in this election with a pledge to ban the full-face veils worn by some Muslim women.
Party leader Paul Nuttall will launch what he calls an "integration agenda" on Monday.
The election manifesto is expected to include banning wearing the burka and niqab in public which they argue is a barrier to social harmony, as well as a security risk.
He will also propose outlawing Sharia law - the religious rules that form part of Islamic tradition.
Who's in the lead?
In the latest election polls, a Comres poll for Sunday Mirror found that 50% of people would vote Conservative, 25% would vote Labour, 11% would vote Liberal Democrat and 7% UKIP.
The 50% support is a Comres poll's highest for a party since 1991.
An opinium poll of 2,003 people for the Observer found that 45% of voters would back the Conservatives if an election was held tomorrow - up seven points from last week - with 26% saying they would vote Labour (down three points), 9% for UKIP (down five points) and the Lib Dems on 11% (up four points).
YouGov for The Sunday Times, meanwhile, also has the Conservatives well ahead on 48% - a 23-point lead over Labour on 25%. It has the Lib Dems on 12% while support for UKIP is just 5%.
Additional reporting from IRN