The utility model discloses a D class power amplifier of remote wireless infrared transmission, including audio signal modulation and transmitting circuit and signal reception and demodulation circuit, audio signal modulation includes the audio frequency plug with the transmitting circuit, with audio frequency connector assembly's audio signal amplifier, and the comparator module be connected with the audio signal amplifier to and the infrared transmission module, the triangular wave signal generator that are connected with the comparator module respectively, signal reception and demodulation circuit include infrared receiver module, and tertiary cascode that the parallel -series connection is connected with infrared receiver module combines enlargies the module, and the tertiary cascode that combines with the parallel -series connection enlargies the drive module that the module is connected, and the full -bridge be connected with drive module alternaties the module, alternate the quadravalence passive filter that the module is connected with the full -bridge, the speaker be connected with quadravalence passive filter. The utility model discloses a remote sound signal transmission who do not occupy the communication frequency channel, does not produce the radiation, not disturbed by interfering signal, and whole circuit is simple.