Sickening footage shows the lout knocking her to the ground with a brutal volley of right hooks on a New Year's night out in Clapham, London.
The clip starts with a security guard holding the woman back – before the thug jumps sends her reeling with a close-range punch to the head.
He forces her to the ground with seven bone-crunching hits before sprinting off down Clapham High Street.
The student victim, Krystal Mission, 21, told MailOnline the man attacked her "out of the blue".
She said: "The side of my face is swollen. I just feel pain everywhere. To be honest I'm just putting everything together at the moment, I was all a bit of blur.
"I just got caught off guard – I wasn't expecting the guy to hit me. He attacked me out of the blue before the video. I don't even know what happened.
"I couldn't watch it until a little while ago, because he was making sound effects in the video – it sounded like he was enjoying it."
An onlooker said: "It was horrible to witness.
"He has left my friend scared and bruised. She also received punches that made her nose bleed.
"There was a group of girls being rude to us so we tried to leave the scene and order an Uber, but while we were waiting the guy came out of nowhere and proceeded to drag and punch my friend.
"We hand't seen him prior to the incident all night. He needs to be arrested as he not only injured her but another one of my friends."
A Scotland Yard spokesman said: "Police attended Clapham High Street, SW4 at 0400hrs after a woman was assaulted by a man outside a nightclub. No arrests at this time."
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