Don’t mess with this cage-fighting king.

A mixed-martial-arts fighter laid a double-fisted beating on a pair of hapless pedestrians he thought were muggers — and he chronicled the carnage in real time over Twitter.

“Dumb f%#^ I just gave him the old style Racoon,” Renzo Gracie wrote to his 100,000 followers, in a reference to how he gave one of the men two black eyes.

His next tweet recounted how he had just choked the guy until he passed out.

“Whispering at his ears . . . that’s what death feels like,” the Brazilian native tweeted.

Gracie encountered the men at 4 a.m. on Tenth Avenue in Chelsea.

It’s unclear if they were really muggers or just innocent victims.

The former UFC fighter told MMAFighting.com he was headed to his car and sensed something was wrong. He claims they followed him, demanded a cigarette and reached into his pocket.