Part of the message is in Russian, an apparent jab at Trump's relationship with Russian President Vladimir Putin.
Trump is set to meet with Putin in Helsinki following his UK visit.
The crop circle, which is reportedly 200 metre wide and took 14 hours to construct, was completed on Sunday. It's located 65km northwest of central London on the Moat Farm in Stoke.
The owner of the farm told the local newspaper The Bucks Herald that he didn't allow the crop circle to be carved into his land for political reasons.
"There was a financial transaction, I won't say how much but it was renumeration for the damaged crops, which won't be salvageable," the owner said.
He added, "A lot of people have asked me this, but my thoughts on Trump are completely neutral. For me it was a transaction between myself and the artist."
The British marketing agency The Tenth Man reportedly took credit for the anti-Trump crop circle on Thursday.
Prior to departing for the UK, Trump suggested people the UK are fond of him.
"I think they like me in the UK. I think they agree with me on immigration," Trump told reporters in Brussels, where he attended a NATO summit.
Many of the same sentiments surrounding the movement behind Brexit are shared by the president and his supporters.
But Trump's visit to the UK has spurred controversy and widespread planned protests, with particularly lively demonstrations in London. One such demonstration that has garnered a fair amount of attention and is set to occur on Friday will involve a giant "Baby Trump" balloon.
As a result of the planned demonstrations, the US embassy in London warned Americans in the UK to keep a "low profile" during the president's visit.
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