Both lanes were initially closed. One lane has now reopened but the first lane will remain closed until the vehicle has been cleared.
There are no reported injuries.
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Northumberland Fire and Rescue Service, in a tweet at 10.48am, posted: ‘A1 in Northumberland closed southbound due to wagon fire. Wagon fire on A1 southbound at Shilbottle, crew from Alnwick and Amble attending with @northumbriapol
‘The A1 is closed southbound.’
North East Live Traffic posted: ‘The A1 is currently closed southbound just south of Shilbottle in Northumberland due to a HGV on fire which appears to have damaged the carriageway, emergency services are at scene.’