The Brooklyn DA’s Office is probing whether an NYPD cop stole $1,300 from a construction worker while searching him in ­Coney Island, officials said.

The investigation was launched after a video emerged showing the unidentified officer putting his hand into the pocket of Lamard Joye and pulling out what looks like papers as the Brooklyn man is ­being held up against a fence shortly after midnight on Sept. 16.

In the video — which was taken by an onlooker with a cellphone camera — Joye can be heard yelling after the officer took the “papers.”

“Give me my money, man! Give me my money!” Joye exclaims.

The officer then pepper-sprayed him, said Joye’s ­attorney, Robert Marinelli.

“The cops thought they could just go in his pockets, take his money, Mace him and leave,” said Marinelli. “If there wasn’t a video, nobody would believe this happened.”

The officer originally approached Joye, 35, after Joye allegedly yelled at cops arresting a young man.

“What are you going to do to him?” Joye said, making a reference to Eric Garner, the Staten Island man who died in July after cops put him in a chokehold, a law-enforcement source said.

After allegedly taking the dough and pepper-spraying Joye, the cop also pepper-sprayed Joye’s sister, Lateefah Joye, who protested the alleged cash grab, Marinelli said. She had also asked for the officer’s shield number.

Lamard had that much cash in his pocket because he planned to take his wife out of town to celebrate her birthday, Marinelli said.

The lawyer said he gave investigators for DA Ken Thompson bank slips and pay stubs to prove Joye had the money legitimately.

Marinelli said he also gave the video to the DA’s Civil Rights Bureau, sparking the probe.

“We are aware of the incident, and it is being actively and thoroughly investigated,” said Thompson.

“The incident was precipitated by a call of a man with a gun,” the NYPD said. “When officers arrived at the scene, they encountered numerous people at the location. As a result of the allegations, the matter is under investigation by the Internal Affairs Bureau and the CCRB [Civilian Complaint Review Board].”

Joye wasn’t arrested or charged, and still hasn’t gotten his money back, Marinelli said.