UK Prime Minister Theresa May is scrambling to get a deal together that will allow the country to split from the EU without political and economic chaos, the deadline fast approaching.
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But Geller - who rose to fame in the 1970s and 1980s for his alleged spoon-bending abilities - says he won't let it happen.
"I feel psychically and very strongly that most British people do not want Brexit," Geller wrote on his Facebook page.
"I love you very much but I will not allow you to lead Britain into Brexit. As much as I admire you, I will stop you telepathically from doing this - and believe me I am capable of executing it.
"Before I take this drastic course of action, I appeal to you to stop the process immediately while you still have a chance."
Geller, who was born in Israel and currently lives there, said the great distance between him and the UK won't be a problem.
"My power has been validated by the CIA, MI5 and Mossad," he said, without providing evidence. He also claimed he was also the telepathic driving-force behind the Soviet Union's signing of a nuclear arms reduction treaty.
He also said he's ensuring Labour leader Jeremy Corbyn never becomes Prime Minister.
Polls show most Brits no longer want Brexit to happen.