The utility model discloses a wireless digital communication system. By using the wireless digital communication system, communication flexibility in a wireless audio transmission system can be increased; a resource utilization rate of the system is increased and power consumption of the system is effectively reduced. The wireless digital communication system provided in the utility model comprises sending end equipment and receiving end equipment. The sending end equipment comprises a communication state acquisition unit, an adjustment information generation unit and a first frame structure adjustment unit, wherein the communication state acquisition unit is used to acquire communication state indication information; when acquiring that the communication state is changed according to the communication state indication information, the adjustment information generation unit generates frame structure adjustment information and sends to a receiving end; the first frame structure adjustment unit adjusts a frame structure by using the frame structure adjustment information so as to carry out data communication with the receiving end. The receiving end equipment comprises an adjustment information receiving unit and a second frame structure adjustment unit, wherein the adjustment information receiving unit is used to receive the frame structure adjustment information; the second frame structure adjustment unit is used to carry out the data communication with a sending end by using the frame structure adjusted by the frame structure adjustment information. The scheme is suitable for a plurality of wireless communication systems which have a high requirement to transmission quality.