The Labour leader released a video from the Social Bite cafe in Glasgow asking viewers to pledge £5 to make a difference this Christmas.
He said: "I want you to help Social Bite. For £5 a homeless person gets a meal this Christmas. Social Bite will be open Christmas Eve and Christmas Day to make sure no homeless person goes hungry that day.
It's Corbyn's second visit to the cafe in recent months
"And then please , another £5. This £5 is for the refugees. Because Social Bite is on its way to Calais and Lesbos to help people desperate, fleeing wars all over the world looking for help.
"Our duty, our job, our normal humanity to help."
Social Bite hope to emulate the success of the 2014 Christmas campaign which raised enough to provide meals for the homeless all year round.
A page has been set up where people can pay £5 to buy a homeless person Christmas dinner, and/or contribute towards a convoy of Social Bite vans which is leaving on 26 December with food and winter essentials to refugee camps in Calais, the Serbia/Croatia border, and Lesbos.
The cafe donates all of its profits to charity. One in four of the cafe's staff are formerly homeless people and they run a "suspended coffee and food’ initiative in which customers can pay upfront for meals and drinks which are then given to homeless people.
Last month, George Clooney stopped to greet people who had waited for hours in the cold, and described the social enterprise as "fantastic".
He told a media scrum outside the cafe: "It's pretty amazing, and I'm looking forward to seeing it, I haven't seen it up close yet.
"I like what they're doing, I think it's a very important cause. I think the idea that we can all participate in everyone's difficulties is really important."
Clooney star described Edinburgh as "beautiful" and said he felt bad for the crowd who had been waiting for him because "they're standing out in the cold".
The carefully managed PR occasion was a far cry from Corbyn's visit a month earlier to the cafe's sister branch in Glasgow where he pre-paid for two meals to be given to homeless patrons.
There were no screaming fans, only this chap.