Tests by Warwick University rate the new variety at 1,067,286 on the Scoville Scale which is used to measure the heat of peppers.
The former record-holder, the Indian Bhut Jolokia, is 1,041,427.
A jalapeno measures just 2,500 to 5,000. Weapons-grade pepper spray is 2,000,000.
The Lincs variety is named Infinity for its "never-ending" burn, which cannot be quelled by even the best antidote, milk.
A novice who eats it can require hospital treatment for mouth blisters and burns.
Grower Woody Woods, 37, of Fire Foods in Grantham, said: "It is like eating red-hot coal.
Make me some damn chili!
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