Abstract: An automatic fire-extinguishing and fire-fighting device for an electric automobile, comprising a powder bottle (2), a bottle head valve (4) connected to the lower part of the powder bottle (2), and a gas bottle (5) connected to the lower part of the bottle head valve (4); the powder bottle (2) is connected to the bottle head valve (4) via a truncated-cone-shaped connecting piece (7); a central gas outlet (9) is disposed along an axis; three lateral gas outlets (10) are uniformly distributed on a side surface; an angle of 100 degrees is formed between the lateral gas outlets (10) and the central axis of the powder bottle (2). The automatic fire-extinguishing and fire-fighting device for an electric automobile separates the powder bottle from the gas bottle, improving device safety and stability; the connection structure enables the gas and powder to be fully mixed, thus achieving better fire-extinguishing and fire-fighting effect.