A positioning structure of a water supply hose for a pull-out faucet contains: a faucet body including an outlet; a water supply hose accommodated in the faucet body so as to supply water and including an outlet segment; a spraying head connected with the outlet segment of the water supply hose and being pulled outwardly and retracted inwardly with the water supply hose; a magnetic attraction device including a first connecting member and a second connecting member which magnetically attract with each other. The first connecting member is disposed in the outlet, the second connecting member is mounted on an outlet segment, the second connecting member retracts back to its original position with the water supply hose and the spraying head and moves into the outlet so as to magnetically attract with the first connecting member, hence the water supply hose and the spraying head are magnetically attracted and fixed.