Prosecutors have ended plea negotiations with Lindsay Lohan and  are preparing for a trial Monday ... this according to law enforcement  sources.

We're told negotiations broke down because Lindsay won't accept  ANY punishment for lying to cops in connection with her car accident last  June.  As we reported, Lindsay told police she was NOT driving the Porsche  that crashed into a truck on Pacific Coast Highway -- she was.

Fact is  ... negotiations were doomed from the get-go, because Lindsay's lawyer,  Mark Heller, did not have his client on board when he tried  cutting a deal.

There's one other chance of avoiding trial.   Everyone must be in court Monday, and Lindsay's lawyer could try and enter a  plea, but given Lindsay's state of mind ... it's highly unlikely.

Trial  will start Monday.  In addition to the lying-to-cops crime, Lindsay could  face months in jail for violating her probation in her jewelry heist case --  part of the probation was to obey all laws.

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