Police were called to Family Golf on Sidcup Bypass at around 5.45pm on Sunday (November 9).
Officers arrived to find paramedics treating the five-year-old.
He was taken to hospital where he remains in a life-threatening condition.
A six-year-old girl was also injured and taken to hospital.
She has since been discharged.
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Family Golf has remained closed since the incident with police on the scene.
A Met Police spokesperson said: “Police were called at 17:44hrs on Sunday, 9 November to Sidcup By-Pass, Chislehurst to reports a child had been injured by a collapsing wall.
“Officers attended and paramedics were treating a five-year-old boy.
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“He was taken to hospital by the London Air Ambulance, where he remains in a life-threatening condition.
“A six-year-old girl was also injured and has since been discharged from hospital.
“Enquiries are ongoing.”
A London Ambulance Service spokesperson said: “We were called at 5.39pm on 9 November to reports of an injured person in Sidcup Bypass, BR7.
“We sent ambulance crews, paramedics in fast response cars, an advanced paramedic and an incident response officer to the scene.
“We also dispatched a trauma team in a car from London’s Air Ambulance.
“We treated two children at the scene, one of whom was seriously injured. Both were taken to hospital.”
Family Golf has been contacted for comment.
