A ring binder, with a fixed bar (1), bearing hooks (2) and a moving bar (3), wherein the fixed bar (1) is immovably fixed on a spine plate of a folder; the bearing hooks (2) are fixed on the upper surface of the fixed bar (1); the moving bar (3) is movably lapped over one side of the fixed bar (1); the lower surface of the moving bar (3) and the lower surface of the fixed bar (1) are clamped and connected with each other; the moving bar (3) can rotate relative to the fixed bar (1) and slide along the length direction of the fixed bar (1); a spring (4) connected between the moving bar (3) and the fixed bar (1); and moving shackles (5) fixed on the upper surface of the moving bar (3). As the ring binder lacks a base plate, a housing, etc., both the opening and the closing of the binder are convenient and the cost of the ring binder is reduced.