The invention provides an electric system safety detection device and system. The electric system safety detection device comprises an ultrasonic distance sensor, an infrared sensor, a transceiver, a locating sensor and a processor. The processer is used for calculating safety information according to signals fed back by the ultrasonic distance sensor and the infrared sensor, and transmitting the safety information and locating information to the transceiver. The ultrasonic distance sensor, the infrared sensor, the transceiver and the locating sensor are connected with the processor. According to the electric system safety detection device, as the sensors are connected with the transceiver through the processor, safety information of a high-voltage line can be fed back in time. In addition, the electric system safety detection system is composed of a plurality of electric system safety detection devices, and therefore the technical problems that safety detection networking cannot be achieved and safety information cannot be fed back comprehensively in the prior art are solved.