The 22-year-old Wales squad player trained with his new team-mates on Friday and will compete with last season’s No 1, Scott Brown, and long-serving Jamie Langfield for the goalkeeper’s jersey.
The former Wrexham player joined Liverpool in 2012 and signed a long-term contract earlier this week after spending time on loan at Sky Bet League Two side Morecambe last season.
Dons boss Derek McInnes told the club’s official website: “I am delighted to get Danny on board. He is a young goalkeeper we have been aware of for some time. We are thankful to Liverpool and Brendan (Rodgers) in particular for allowing this to happen.
“He is someone who is highly regarded at his club and they see the importance of getting him out on loan. Danny now has the task and challenge of playing football at a good level with us.
“We have real competition for places in all areas of the team, and we certainly now have that in the goalkeeping position.
“We believe Danny is going to have a good career as he goes forward and we are looking forward to the opportunity of working with him as part of his development.
“He can also help us to be successful.”