Jill Hughes had intended to stand for election in the Yorkshire constituency of Batley and Spen, but is now set to be replaced by her party.
It follows revelations published by campaign group Hope Not Hate which discovered details of Ms Hughes’s bizarre beliefs.
The group unearthed social media posts in which Ms Hughes claimed to be from a distant star called “Sirius”.
And in her novel “Spirit of Prophecy", which was released last year, Ms Hughes claimed in the acknowledgments that extraterrestrials (ETs) are working with world governments.
"The E.T's, some of them less than apple pie wholesome or positive pumpkins, are already here working with our world governments, but that's all hush-hush for now," she reportedly wrote.
Information about the author listed on Amazon also said: “To this day J.J.Hughes believes in elves/fairies/mermaids/unicorns and all things Elemental and Other Worldly.
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“She has had numerous prophetic premonitions – usually about death, which so far despite a few close shaves she has escaped.
“She came to believe in reincarnation in her mid-twenties when her old horse Red made a re-appearance, this time as a palomino called Hooray Henry.”
Yahoo News has contacted the Brexit Party for comment.
It comes as Brexit Party leader Nigel Farage vowed to target the five million Labour voters who backed Leave in the referendum as he unveiled his party’s candidates for the General Election yesterday.
Mr Farage dismissed accusations he would split the pro-Brexit vote by running against the Tories, saying Boris Johnson’s deal was “not Brexit”.
Speaking at an event in Westminster, he accused the Conservatives of “conceited arrogance” after the Leader of the Commons Jacob Rees-Mogg urged him to step aside and “leave the field”.
Mr Rees-Mogg warned he was in danger of snatching “defeat from the jaws of victory” for the campaign to leave the EU.
However, Mr Farage – who offered to work with Mr Johnson in a “patriotic alliance” if he dropped his deal with Brussels – said the Tory plan was a “sell-out”.