The invention belongs to the technical field of equipment detection, and relates to an automatic detection device for an electric meter certificate. The upper end of the detection device is provided with a color mark sensor; the color mark sensor is serially connected with a signal processing unit and a first relay in sequence through electrical information; the signal processing unit comprising transistors receives signals of the color mark sensor, and the signals are output to the first relay after being processed; the input end, outputting power supply and connected with commercial power, is electrically communicated with the first relay, and the other end, for output, is electrically communicated with the color mark sensor; the first relay is electrically connected with a timer and an electrical conversion element at the same time, the timer is electrically communicated with the electrical conversion element through a second relay, the electrical conversion element is serially and electrically connected with a pneumatic element and a baffle plate in sequence, the baffle plate is fixedly provided with a switch, and the switch is electrically communicated with an alarm. The device is simple in structure, reliable in principle, easy and convenient to operate, high in automation level, high in production efficiency, good in detection accuracy, and high in detection speed and has the environment-friendly effect.