The 25-year-old was rushed to hospital after the attack, which happened in Haringey, London.
Metropolitan Police said in a statement: “Police were called at 2.19pm on Sunday August 11 to Seven Sisters Road, at the junction with St Ann’s Road, after reports of a stabbing.”
“Officers attended and found a 25-year-old man suffering from multiple stab injuries.
“He has been taken to hospital where he is in a life-threatening condition. His next of kin are aware.”
No arrests have been made as of yet.
A section 60 order has now been put in place across the borough of Tottenham.
Section 60 of the Criminal Justice and Public Order Act 1994 allows a police officer to stop and search a person without suspicion.
The attack comes just two days after a police officer was stabbed in a “sudden and brutal” attack in Leyton, also in London.
The officer, in his 30s, suffered serious injuries but is now understood to no longer be in a life-threatening condition.
He was stabbed at around midnight on Thursday after attempting to stop an at the junction of Coopers Lane and Leyton High Road.
The vehicle’s driver failed to stop and then got out of the van and injured the officer with the machete, police said.
The policeman managed to use his Taser despite having been stabbed and arrested by another officer.
London’s knife epidemic has reached unprecedented levels with 84 deaths in the capital since the start of 2019.
Last year was London’s bloodiest in a decade – when the number of homicides reached 132 – and it shows no signs of abating.