The utility model relates to a core of antidetonation type sulfur hexafluoride density relay and density meter, including core support frame, elastic metal curved tube, drive gear, pointer gear and pointer, drive gear and pointer gear all connect on the core support frame through the pivot and intermeshing, and the elastic metal curved tube is connected and is conveyed the gear, the pointer sets up on the pointer gear, and the pointer gear is sector gear, is provided with on the core support frame of pointer gear top to be used for blocking upwards pivoted dog of pointer gear continuation. The beneficial effects of the utility model are that: set up a dog on the pointer gear, when the pointer gear soon took off the tooth, the dog can just block the core gear to prevent that it from under great impact sympathetic vibration is emotionally compared, the tooth condition appearing taking off easily.