High-stability connection device

The invention, which relates to a connecting apparatus, discloses a high-stability connection device comprising a first connecting rod, a second connecting rod, and a plugging pipe. Plugging seats are arranged inside the upper end and the lower end of the plugging pipe. A first connecting part is arranged at the upper end of the first connecting rod and the lower end of the first connecting rod is inserted through the plugging seat at the upper end of the plugging pipe. A second connecting part is arranged at the lower end of the second connecting rod; and the upper end of the second connecting rod is inserted through the plugging seat at the lower end of the plugging pipe. The lower end of the first connecting rod and the upper end of the second connecting rod are fixedly plugged in the plugging pipe and thus the two connecting rods can not rotate relatively, thereby guaranteeing stability of instrument installation. Because the instrument doses no shake during the application process, the measurement precision is further improved. Meanwhile, on the basis of the plugging structure of a bearing isolation ring, an elastic claw ring, and a rod dismounting element, the instrument installation becomes convenient; and the connecting rods are compressed by elastic claws of the elastic claw ring, thereby guaranteeing firm installation of the connecting rods.