The invention discloses a power system operation instruction execution method, device and system based on automatic speech recognition. The method comprises the steps that a speech instruction set isacquired, wherein the speech instruction set comprises an operation instruction and a power grid model name; an obtained audio stream is converted into a character string online based on the automaticspeech recognition service; the character string is subjected to secondary conversion on the basis of a maintained word and phrase mapping file, and a new character string is formed; and the new character string is automatically recognized on the basis of the obtained speech instruction set, an operation instruction is obtained, and the operation instruction of the power system is executed. According to the method, the automatic speech recognition service is integrated, and speech of operating personnel of the system is converted into characters, so that a corresponding system instruction isexecuted, and the method has the characteristics of being flexible, convenient and accurate to recognize, and the efficiency of automatic operation of the system is improved.