The invention discloses a sector reciprocating cloth discharging mechanism and belongs to the technical field of textile machines. The sector reciprocating cloth discharging mechanism comprises an upright and a beam connected to the top of the upright. A cloth distributing motor and a cloth discharging motor are installed on the beam. The cloth distributing motor drives a cloth distributing wheel to rotate. Swing arm pull rods are hinged to the circumference of the cloth distributing wheel and the other ends of the swing arm pull rods are hinged to the upper ends of swing arms. Cloth guide rods are installed at the lower ends of the swing arms. The swing arms on the two sides are hinged to the two shaft ends of a cloth discharging roll respectively. The cloth discharging motor drives a cloth discharging roll to rotate. The cloth discharging roll is provided with a compression roll. Rocker arms are installed at the two ends of the compression roll. The middle portions of the rocker arms are hinged to the upper ends of the swing arms through hinge shafts. The other ends of the rocker arms are hinged to the ends of piston rods of air cylinders. Cloth is wound around the cloth discharging roll and pressed by the compression roll so that in the cloth discharging process, it can be guaranteed that the cloth and the cloth discharging roll are operated synchronously without slips; and the pressure of the air cylinders is adjusted so that the pressure of the compression roll can be controlled, and the situation that the cloth discharging roll is damaged due to the too high pressure is prevented.