In the latest case of apparent brutality within Victoria's police force, new CCTV footage has emerged showing officers stomping on a suspect as he lies handcuffed and pinned to the ground in a Melbourne chemist.

The distressing footage shows the shirtless offender being hit and kicked repeatedly in the head by one police officer as another kneels on his torso.

The 2016 CCTV vision obtained by The Age shows the arrest of a 23-year-old Sudanese-born Melbourne man who was caught robbing a Preston chemist.

Video shows the man being repeatedly hit, punched and stomped on by police. (Supplied) (Supplied)

The man is punched by an officer. (Supplied) (Supplied)

The man was reportedly suffering a psychotic episode before his arrest. (Supplied) (Supplied)

The man was confronted in a back corridor by a civilian, before a pair of male officers arrive on the scene, running to trap the robber from the back of the store.

In full view of bystanders, they pin the 23-year-old – whom The Age reports was suffering a psychotic episode – to the ground.

As police struggle to handcuff the suspect, a sunglasses-wearing officer lands nine heavy blows to the Sudanese man’s head, one after the other.

He then kicks the side of his skull, strikes him three times with the end of his police baton and then – after the suspect has been subdued and handcuffed – stomps down hard on his back with his right boot.

Despite the brutality of the 37-minute incident, the police’s Professional Standards Command reportedly deemed it “not serious enough to sanction”, The Age reports.

The video comes after Fairfax’s explosive report on a disabled pensioner being taunted by a group of policemen in Preston, which has raised questions over Victoria’s police complaint system.