Security cameras have captured the moment a blood-soaked stabbing victim walked into a Sydney service station and collapsed at the counter asking for help.

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The 33-year-old had driven himself to the petrol station on Punchbowl Road, Punchbowl after being stabbed numerous times in the chest and wrist in a vicious attack.

Video shows him walking into the station with his shirt entirely covered in blood. Once he reached the counter, he slumped down to the ground while the attendant called an ambulance.

"I was in my regular work and when I turned back there was a guy who was already attacked and he came for rescue into our service station," the attendant who was working at the time told Nine News.

"I let him sit down and I gave him some water and I asked police and ambulance to come here."

The attendant looked closely at the man to check the injuries were real and not faked before giving him his shirt.

Paramedics and police arrived on the scene soon after and the victim was taken to hospital.

He was in a stable condition in hospital this morning and is expected to have surgery later today.

It was later reported that a thick trail of blood was still visible, spattered across the petrol station forecourt this morning.

Police have launched an investigation.

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