Graham Holden and his partner found the wreckage after shifting sands uncovered the site at Cleethorpes.
According to the Grimsby Telegraph, the aeroplane is believed to be an RAF Bristol Beaufighter which crashed soon after take-off from nearby North Coates in Lincolnshire in April 1944.
Mr Holden said he was “amazed” to have found the wreck.
“I’ve walked this beach for nearly 30 years on a regular basis and I’ve never seen it,” he said.
“I was just glad it was found, so at least we can log it down and maybe one day it will uncover itself again.”
The Coastguard has asked people to stop searching for the wreck as mud and fast incoming tides make the area dangerous.
Mr Holden said he hoped to confirm with experts it was the crashed RAF North Coates Beaufighter by taking photographs of the instrument panels, parts of which remain intact.
Both crew members survived the accident without any injuries.
The twin-engined Beaufighter was used as a night fighter and ground attack aircraft, especially against shipping when it was armed with torpedoes.
RAF North Coates was located six miles south-east of Cleethorpes. It opened as an air base in 1914 and was closed in 1990. It is now used as a private airfield.
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