The invention provides a frequency-modulated wireless microphone with a single battery. The frequency-modulated wireless microphone with the single battery is characterized by comprising the 1.5V battery, an acoustical signal input circuit, an audion biasing circuit, a high-frequency oscillation circuit and a high-frequency signal emitting circuit. According to the microphone, the single battery and a single NPN-type audion are used, and frequency-modulated waves are achieved through change of the oscillation frequency of the high-frequency oscillation circuit. The single NPN-type audion is used for the circuit, so that the circuit is free from involvement and interference of front and rear levels, and the frequency of the high-frequency oscillation circuit is stable. The frequency-modulated wireless microphone is applicable to audio signal transmission of wireless headsets, which are high in fidelity requirement, and the frequency-modulated wireless microphone can be used for assisting activities such as teaching or karaoke in a large classroom. The frequency-modulated wireless microphone with the single battery has the advantages that the circuit structure is simple, the high-frequency oscillation frequency is stable, the power consumption is low, the emitting distance can reach 25m, the manufacturing cost is low and the like.