A TSA screener at JFK Airport pilfered a passenger’s pricey watch — then smashed it to bits as she panicked when officials viewed surveillance video, law enforcement sources say.

Margo Lauree-Grant, 41, was busted about 9 p.m. Wednesday for allegedly swiping the Canadian man’s $7,500 Diamond Master on Aug. 26 after he passed through a checkpoint at Terminal 7, sources said.

The man reported his timepiece missing after realizing he’d left it behind during screening, a source said.

When TSA officials and Port Authority cops began reviewing video, Lauree-Grant became nervous and began to panic, a source said. She left the area and “smashed the watch into pieces. She destroyed it,” a law enforcement official said.

The footage allegedly showed Lauree-Grant stealing the watch, which was later recovered in pieces.

Lauree-Grant, of Montauk Avenue in Brooklyn, was charged with grand larceny, possession of stolen property and official misconduct.

Her bust marked the second arrest of a local TSA screener in a week.

A TSA supervisor at LaGuardia Airport was busted last week for allegedly sexually molesting a South Korean college student.

Maxi Oquendo allegedly lured the woman into a men’s room under the pretense she needed more screening, then molested her, sources said.

He was charged with sex abuse, forcible touching, unlawful imprisonment and official misconduct.