An active overvoltage protection gap with a plug-and-pull functions in a gas environment, comprises a cavity with an air pressure of 10<0> to 10<3> or 10<4> to 5 * 10<5> Pa, An upper electrode is arrange in that cavity, a discharge gap formed between the annular intermediate electrodes, a disk-shaped trigger electrode is mounted in the cavity, Between that trig electrode and the intermediate electrode, an annular insulating dielectric material is arrange, a surface flashover discharge interface is for between that trigger electrode, the surface insulating dielectric material and the intermediate electrode to form an active overvoltage protection gap, and the surface flashover discharge interface is perpendicular to or at an acute angle with the low surface of the intermediate electrode, and a shielding cover is arranged in an upper insulating shell around the upper electrode and the intermediate electrode. The upper electrode, the middle electrode and the trigger electrode all extend out of the plug for external electrical connection. The invention can reduce the pulse breakdown voltage of the overvoltage protection gap, and has the characteristics of extremely fast response, strong power frequency freewheeling suppression ability and longer service life.