Ross Greer argued that “enemy states” were likely to try to sow the seeds of chaos and mistrust, adding that he was particularly concerned about the elderly.
Pro-Russian propagandists have previously been accused of trying to discredit the results of the 2014 referendum.
Last year, SNP MP Stuart MacDonald published a report expressing concern about “anti-state actors who want to confront the principles on which our society is built.”
Both the SNP and the Greens, which have a power-sharing deal, want a second referendum before the end of 2023, although the UK government is unlikely to agree.
Speaking on a non-tribal politics podcast, Mr Greer said Scotland should look at 2014 “with pride”.
He said: “I think if we can imitate that we are doing really, really well, but we should also learn from what has happened since then.
“We know that next time there is going to be a lot more deliberate, malicious misinformation.
“So I think what really matters before the referendum – and both governments need it, all political parties need it – is that we talk collectively about how we educate the people, and I mean that Not to be outdone, patronizing, but how do we help people differentiate between fake news, misinformation, etc., and the real thing?
“Because it is the greatest threat not only to our democracy, but to the democracy of the world at the moment – it is a deliberate attempt to put misinformation into public debate.”
He added: “I think this should be a collective mission for us. Public information campaigns, education in schools, etc., to show people, how do you make sure you take a critical look at this thing?” can?”
Mr Greer said it was “not always easy” and that a lot of misinformation was shared on social media, adding that “you don’t have to look far into the mainstream media to find the wrong things. “
He said he was less concerned about young people than he was about older people, adding: “And by that I’m not just talking about people 60 and older. Yes – maybe someone over the age of 35, if I have to set it up there is a very reasonable limit on that. “
Mr Greer said: “There will be people in this campaign spreading misinformation from both sides, not necessarily wanting one side or the other to win, but because we know, for example, something. With enemy states, some other countries, they only spread misinformation to sow the seeds of chaos, the seeds of mistrust, not that they want any particular result.
“I am convinced that there will be people who will claim that Putin, for example, wants to vote in the next independence referendum for any reason, either yes or no.
“I think more than anything else, it is very likely that hostile governments, like in Russia, would only want to spread as much chaos as they can in the debate so that people do not trust each other, so that trust. They do not. Their authorities, therefore, do not trust the media. It is in the interest of those who want to undermine our democracy. “