A curtain reel structure for assembling a blind cord rapidly, the curtain reel structure comprising: a winding spool; a reel seat on which the winding spool is assembled; a first positioning device disposed between the winding spool and the reel seat; and a second positioning device disposed between the winding spool and the reel seat; characterized in that: said first positioning device comprises a first chamber and a first sliding seat, wherein the first chamber is provided with a first opening for allowing insertion of the first sliding seat and a first active channel on the other side thereof for communicating the first chamber with an external, and wherein the first sliding seat is provided with a first accommodating slot for accommodating the blind cord and corresponding to or staggering with the first active channel; and said second positioning device comprises a second chamber and a second sliding seat, wherein the second chamber is provided with a second opening for allowing insertion of the second sliding seat and a second active channel on the other side thereof for communicating the second chamber with the external, and wherein the second sliding seat is provided with a second accommodating slot for accommodating the blind cord and corresponding to or staggering with the second active channel, a pull on the blind cord making the first accommodating slot of the first sliding seat and the second accommodating slot of the second sliding seat respectively stagger with the first active channel and the second active channel so as to lock the blind cord. a winding spool; a reel seat on which the winding spool is assembled; a first positioning device disposed between the winding spool and the reel seat; and a second positioning device disposed between the winding spool and the reel seat; characterized in that: said first positioning device comprises a first chamber and a first sliding seat, wherein the first chamber is provided with a first opening for allowing insertion of the first sliding seat and a first active channel on the other side thereof for communicating the first chamber with an external, and wherein the first sliding seat is provided with a first accommodating slot for accommodating the blind cord and corresponding to or staggering with the first active channel; and said second positioning device comprises a second chamber and a second sliding seat, wherein the second chamber is provided with a second opening for allowing insertion of the second sliding seat and a second active channel on the other side thereof for communicating the second chamber with the external, and wherein the second sliding seat is provided with a second accommodating slot for accommodating the blind cord and corresponding to or staggering with the second active channel, a pull on the blind cord making the first accommodating slot of the first sliding seat and the second accommodating slot of the second sliding seat respectively stagger with the first active channel and the second active channel so as to lock the blind cord. said first positioning device comprises a first chamber and a first sliding seat, wherein the first chamber is provided with a first opening for allowing insertion of the first sliding seat and a first active channel on the other side thereof for communicating the first chamber with an external, and wherein the first sliding seat is provided with a first accommodating slot for accommodating the blind cord and corresponding to or staggering with the first active channel; and said second positioning device comprises a second chamber and a second sliding seat, wherein the second chamber is provided with a second opening for allowing insertion of the second sliding seat and a second active channel on the other side thereof for communicating the second chamber with the external, and wherein the second sliding seat is provided with a second accommodating slot for accommodating the blind cord and corresponding to or staggering with the second active channel, a pull on the blind cord making the first accommodating slot of the first sliding seat and the second accommodating slot of the second sliding seat respectively stagger with the first active channel and the second active channel so as to lock the blind cord.