The invention discloses an intelligent detecting and protection output device of an electric system. The intelligent detecting and protection output device comprises a breaker, the breaker comprises ahost, and the host comprises a detecting terminal, a printer, a display screen, a plurality of output indicating lamps, a plurality of output buttons, a grounded terminal, a direct-current voltage selecting switch, a USB interface and a three-key rotary mouse. The three-key rotary mouse is arranged on the surface of the host and rotationally connected with the host, the display screen is embeddedinto the surface of the host, and the output indicating lamps, the output buttons, the direct-current voltage selecting switch, the grounded terminal and the USB interface are all arranged on the surface of the host. An intelligent detecting and protection output method of the electric system is further included. The intelligent detecting and protection output device of the electric system can analyze parameters, is high in interface compatibility, high in safety performance, high in equipment adaptability, convenient and fast to operate and efficient and can output data.