The invention discloses a breathalyzer, which comprises a breathalyzer front side, a breathalyzer back side, an air inlet, a display screen, a detecting switch, an air outlet, a loudspeaker, a battery, an electric shock head, a voice device, a warning lamp and a key ring, wherein the air inlet, the display screen, the detecting switch, the loudspeaker and the warning lamp are arranged at the outersurface of the breathalyzer front side; the air outlet and the electric shock head are arranged at the outer surface of the breathalyzer back side; the battery and the voice device are arranged inside a part between the breathalyzer front side and the breathalyzer back side; the key ring is arranged at the outer surface between the breathalyzer front side and the breathalyzer back side. The breathalyzer is provided with the voice device and is provided with a built-in memory card; when the content of alcohol in a human body to be tested exceeds the standard, the warning lamp is turned on; voice stored in the voice device can be played, so that a jingler can fast sober up.