A reckless Porsche driver plowed over and seriously injured a teenage boy as he walked across a Brooklyn street Sunday night, cops said.

The 14-year-old was in Greenpoint near Greenpoint Avenue and Manhattan Avenue when he was struck by a white Porsche Cayenne driven by Guo Lu, 39, just after 6 p.m., according to police.

“I thought it was a bomb or something,” recalled Abdullah Muhammad, a 23-year-old assistant manager at a nearby check-cashing outlet. “He flew 10 feet in the air.”

After striking the teen, the Porsche careened into a pole at the entrance of Muhammad’s business, he said.

The boy was rushed to Bellevue Hospital, where he remained in serious condition. Cops said his injuries were serious, but not life-threatening.

A woman and two men were present at the scene by the crashed vehicle, but their role in the accident was not immediately known. Cops later arrested Lu and charged him with reckless endangerment.

It was unclear if he was speeding at the time of the incident or whether the teen was in a crosswalk.