Turner, 25, joins the Reds as they look to maintain their unbeaten start to the FA WSL Spring Series.
Versatile defender Turner has previously played for the likes of Notts County Ladies, Leeds United Ladies and Doncaster Rovers Belles.
On completing her switch to Liverpool, she said: “This is a fantastic move for me and I’m really excited to join up with the squad. The girls have proven so far in the FA WSL Spring Series what massive potential the team has, so hopefully I am able to make the squad even stronger.
“Liverpool Ladies are a team with big ambitions and I am confident that we can have a successful end to the FA WSL Spring Series before the full season starts in September.