The inquest heard how the 27-year old had 416mg of alcohol per 100ml of blood, meaning she was five times over the legal drink driving limit of 80mg.
A post-mortem carried out on Winehouse's body found that she had huge amounts of alcohol in her system, which could have stopped her breathing and sent her into a coma.
No illegal substances were found during the examination, and her vital organs were also said to be in good health.
St Pancras coroner Suzanne Greenway said: "She had consumed sufficient alcohol at 416mg per decilitre (of blood) and the unintended consequence of such potentially fatal levels was her sudden and unexpected death."
Winehouse, who had managed to kick her drug habit, apparently started drinking again in the days leading up to her death, with her GP, Dr. Christina Romete, stating she warned the Back To Black star of the dangers.
Roemete told the inquest: "The advice I had given to Amy over a long period of time was verbal and in written form about all the effects alcohol can have on the system, including respiratory depression and death, heart problems, fertility problems and liver problems."
She explained: "She had her own way and was very determined to do everything her own way. Including any form of therapy. She had very strict views."
When asked if Winehouse understood the risks of continuing to drink, she answered: "Yes, during the period of July she was abstinent but started drinking alcohol on July 20 - it was confirmed to me by her security guard."
On the night before her death, Amy allegedly told the doctor that she didn't know if she could stop consuming alcohol, but admitted "she did not want to die."
As Amy's emotional parents Mitch and Janis listened from the public gallery, Roemete added: "She was looking forward to the future."