In interview with the Danish daily Politiken, Jens Andersen, director of the Hansholm Museum, said wind had blown free the sand that had covered the bunker for more than six decades.
When experts were able to enter the structure, located west of the town of Ringkobing on the Jutland peninsula, they found the interior had been undisturbed since being abandoned by German troops.
The archaeologists found bunks, chairs, cabinets, parts of uniforms and even bottles of ink that soldiers had left behind.
"It's fantastic," said Andersen. "I would have never thought something like this would have been possible."
According to the museum director, the bunker had probably been covered by shifting sands so quickly after the German surrender in May 1945 that there was no time to empty it of its contents.
More than 5,000 bunkers line Denmark's North Sea coast. They were part of Nazi Germany's so-called "Atlantic Wall" defensive line.