A quick release extension rod with a positioning structure comprises a body, a return member, an inserting rod, an even number of balls, a positioning ring, a control ring assembly, four elastic members and a C-shaped retainer. The balls are disposed on the connecting head of the inserting rod, so that the radial interval between the socket and the connecting head of the base of the quick release extension rod can be evenly distributed. When the socket rotates, the arrangement of an even number of balls can reduce the possibility of the asymmetrical-center-of-gravity caused oscillation. The four elastic members are disposed between the control ring assembly and the body to push the socket can be abutted against the control ring assembly to delimitate the axial interval, which further stabilize the center of gravity of rotation of the socket while preventing the occurrence of oscillation of the socket.