An unhinged man shoved a straphanger onto Brooklyn subway tracks early Wednesday — and the shaken victim later told The Post that he’s lucky to be alive.

Kenneth Izevbigie, 50, of Brooklyn recalled how his random attacker seemed to first set his sights on a woman at the end of the platform at the Rockaway Avenue station in Brownsville around 6 a.m.

“He wanted to harass someone at the end of the platform, a lady,’’ but he apparently quickly gave up on that, Izevbigie, a security guard with two daughters, said by phone.

“He started yelling. … I don’t know what he was yelling. He was coming towards me.

“I never wanted to look at his face because I knew that he was not stable. So I avoided looking at him. I was just using my phone. I didn’t want to attract attention,’’ said the rider, adding he was on his way to visit a cousin in Jackson Heights, Queens, at the time.

“When he was about to pass me, he just stood,’’ the dad said. “Because I was sitting and he was standing, I didn’t want him to attack me, so I stood up.

“When I stood up, he pushed me. I was trying to say, ‘What’s wrong with you? What’s wrong with you?’ He started talking, but I don’t know what he was saying. He was angry.

“Before I knew it, he pushed me again. I lost balance and fell on the tracks,’’ said Izevbigie, who moved to the city from Dallas, Texas, in 2020.

“He pushed me, he didn’t punch me. I was not expecting it. When I knew I was going to fall, I had to try to land properly so I didn’t hit my head or break my arm.

“He threw my bag on the tracks. Then he jumped on the tracks. I thought he was going to attack me again, but when I stood up, he climbed back on the platform.

“He just walked away.”

Izevbigie said he wasn’t worried about getting hit by a train because he knew from the schedule that the next subway wasn’t due for about 7 more minutes.

But “it was horrible,’’ he said of the experience.

“I count myself lucky I wasn’t injured.”

The shover has yet to be caught.

Izevbigie said cops drove him around the area for about 30 minutes looking for his attacker, but he wasn’t confident enough to ID anyone.