Disturbing vision has emerged of a cowardly attack where a man was kicked in the head just after being hit from behind.

The video, which was taken in Fortitude Valley on Saturday morning, appears to show one man throwing punches before his friend blindsides the victim by punching him in the back of the head.

As the victim lies unconscious on the ground, the original attacker then proceeds to kick him in the head.

The victim was coward punched from behind while his original attacker was throwing punches (9NEWS)

Bystanders then stepped in to stop the victim suffering any further injuries.

The attack occurred at the entrance of the McWhirters Marketplace on Wickham Street.

After falling to the ground, the attack continued with kicks to the victim's head (9NEWS)

A complaint is yet to be made to police.