The tree came down in 80mph (128km/h) winds during Storm Herminia in Trenarren, near St Austell, on Sunday.
The 18 residents have also been without phone signal or internet for three days.
Resident Mike Chantry said they were relying on deliveries from people with vehicles on the other side of the tree.
Mr Chantry said: "The tree has been up for over 100 years and it's massive. So now, we're all stopped in the village and can't get out.
"I work in Plymouth and other villagers work in Truro, so we're stuck at the moment."
Elsewhere in Cornwall, the clear up continues after the storm left damage across the county.
On Tuesday morning, a Met Office yellow warning for wind passed at 06:00 while another for rain passed at 10:00 GMT.
Hundreds of homes were without power but only a handful were off supply once the warnings had passed.
Cornwall Council has been contacted for comment.
