The victim was attacked by a group of young men by a row of shops in Charlton Road at 1pm on Monday, according to witnesses.
His condition is not yet known by the police.
A Met spokesman said: “Police were called shortly to reports of a male stabbed on Charlton Road, SE7.
“Officers, the London Ambulance Service and London’s Air Ambulance attended.
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“The man, believed to be aged in his early 20s, was taken to hospital; we await an update on his condition.”
There have been no arrests and police enquiries continue.
Anyone with information is asked to call police via 101 quoting reference CAD 3187/13Mar.
