A drunken Brooklyn man fell onto elevated subway tracks before miraculously dodging a J train yesterday — and he doesn’t remember a second of it.

Arshad Kahn, 25, told The Post he had been partying at a nightclub before stumbling onto Brooklyn-bound tracks at the 121st Street station in Jamaica at about 6 a.m.

Kahn dodged death by crawling — or by dumb luck, falling — into the track’s trough, the lowered space between rails.

“I don’t remember what happened,” said the East New York contractor. “I was on the platform. The next thing I remember was the Fire Department pulling me out. How did I survive? I don’t even know.”

Not only did Kahn survive, but there wasn’t a scratch on him. The only mark left on Kahn was on his arm, where paramedics inserted an IV.

“My back hurts a little, but that’s it,” said Kahn, still groggy from his wild night out.

Additional reporting by John Doyle and David K. Li