Cops busted a Staten Island ex-con who they say struck a 14-year-old pedestrian in Brooklyn and then drove away after briefly feigning concern for the girl.

Julia Litmonovich, 49, was arrested Wednesday afternoon on a slew of charges related to the March 27 hit-and-run, in which she allegedly barreled into Xin Yi Wang as the teen was crossing 47th Street at 9th Avenue in Borough Park, police said late Wednesday.

She boasts more than 30 prior arrests — most recently for driving away after a previous car crash, sources told The Post.

Shocking surveillance footage of the incident shows Litmonovich’s speeding Dodge Challenger crash into Wang, who was in the crosswalk — hurling the teen into the roadway, where she just missed oncoming traffic.

Litmonovich, from Staten Island, got out of her Dodge and appeared concerned for Wang, who suffered bumps and bruises but was otherwise okay.

“Are you OK? Do you need me to take you to the hospital? Or bring you home?” she said, according to Wang.

But only moments later, she climbed back into the Challenger and drove away, the video shows.

Police identified Litmonovich as the person of interest late Tuesday. She was in custody less than 24 hours later.

Litmonovich was picked up at her Oakwood home and charged with leaving the scene of an accident with an injury, reckless endangerment, assault, reckless driving, failure to yield to a pedestrian, failure to exercise due care and speeding, police said.

She was briefly hospitalized after complaining of shortness of breath following her arrest, but is due to appear before a judge on Thursday.