The invention discloses a voice recording shielding device and a voice recording shielding method. The shielding device comprises a power unit, a control unit, a modulation unit, a noise unit, a high-frequency transmitting unit, a wireless radio frequency unit, a power amplification unit, a PTZ unit and an electromagnetic pulse unit. According to the voice recording shielding device disclosed by the invention, by employing ultralow frequency transmitting, a receiving end of an acoustic sensor is blocked directly, so that a received acoustic signal cannot be extracted and restored after the receiving end is saturated, and simultaneously no harm is brought to a human body and environment; by selecting an effective noise source and employing multiple modulation manners for the noise source, the modulated noise source has no rules to follow; and meanwhile, by employing an effective transmitting manner, the requirements that the transmitting distance is as distant as possible, the frequency spectrum coverage range is as wide as possible and the saturation effect is as good as possible, and the like are satisfied.