A woman was shot on the property of a high-end equestrian facility in New Jersey, allegedly by the center’s former US Olympian owner — just days after she wrote on social media that her life had been threatened.

The woman, whose name is being withheld by The Post as authorities work to notify her family, is in grave condition after she was shot multiple times in the chest Wednesday afternoon on the 53-acre Hawthorne Farm in rural Morris County, officials said.

Former US dressage Olympian Michael Barisone is in custody and is expected to be charged Thursday in the attack, characterized as a landowner-tenant dispute, sources told The Post.

The woman wrote on Facebook five days before she was shot that she had been told to “sleep with one eye open.”

That post is one of several on the woman’s account detailing an ongoing personal squabble, though none of the messages identify the other party by name.

Cops were also called to the Long Valley farm — home to the Barisone Dressage training facility — at least a half-dozen times in the past week, sources said.

Barisone and a third person, who’s yet to be publicly identified, were injured in the shooting incident, though not by gunfire.

Barisone, who was the 2009 Sportsman International Horseman of the Year, has trained Olympians, including Allison Brock, who won a bronze medal for the US in dressage at the 2016 games in Rio.

“Michael consistently produces upper-level dressage horses from young stock, selling many of them and keeping some to develop for himself,” according to the bio on his website.

It was not immediately clear if Barisone had legal representation, and he could not be reached for comment.

A worker at Barisone Dressage refused comment on Thursday.

Additional reporting by Alex Taylor