Joe Walsh: Someone's Trying to Kill Me!

"Eagles" guitarist Joe Walsh claims a man in his 70s has threatened to shoot him dead ... this according to new court documents.

But the septuagenarian suspect doesn't seem like a fragile old man -- Walsh says the old guy already attacked his personal assistant with a block of wood.

It's all laid out in legal documents filed by Walsh in which the rock legend claims -- Nassar Adhoot -- who owns land near Walsh -- trespassed on his property earlier this month.

In the docs, filed in L.A. County Superior Court, Walsh claims his P.A. approached Adhoot ... but the old guy attacked him and then shouted, "You tell Joe Walsh I'm going to kill him. I'm going to shoot him."

Walsh says he was so freaked out -- he filed for a restraining order to get protection for himself, his wife, his assistant, his maid and his gardener.