The invention discloses a mixed sound recording blocker comprising a power unit, a control unit, a modulation unit, a noise unit, a high-frequency emission unit, a radio frequency unit, a power amplifier unit, a PTZ unit, and an electromagnetic pulse unit. The noise unit includes a white noise generator and a pink noise generator. The mixed sound recording blocker of the invention adopts ultra-low-frequency emission, the receiver of an acoustic sensor is blocked directly, so that the receiver cannot extract or restore received audio signals after saturation, and no harm is brought to the human body or the environment. An effective noise source is selected, and the noise source is modulated in multiple modulation modes so the modulated noise is irregular. An effective means of emission is adopted to meet the following requirements: the emission distance is as far as possible, the spectral coverage is as large as possible, and the saturation effect is as good as possible.