Ten fire crews are tackling a blaze off Stock Lane near Marlborough.
The fire appliances were witnessed responding to the incident at Ramsbury Brewery, close to Aldbourne, at around 7.30am.
Traffic reports show some traffic delays on Stock Lane as emergency services work at the scene.
Dorset and Wiltshire Fire and Rescue Services says ten fire engines and other appliances are in attendance.
Crews from Marlborough, Swindon, Stratton, Westlea, Royal Wootton Bassett, Ludgershall, Ramsbury, Newbury and Hungerford are at the incident.
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