Self-guiding floating type connecting device based on BTA tool

The invention relates to the technical field of BTA tools, in particular to a self-guiding floating type connecting device based on a BTA tool. In order to solve the problem that the machining quality of a workpiece is affected due to the fact that a drill rod is prone to bending deformation in the machining process of the BTA tool, the self-guiding floating type connecting device based on the BTA tool is provided and comprises a drill bit connector, a middle connector and a drill rod connector. A first boss on the inner wall of the drill bit connector is tangent to the outer wall of the middle connector, the left countersunk bolt abuts against the top and the bottom of the middle connector, the normal of a second boss on the inner wall of the drill rod connector is perpendicular to the normal of a second boss on the inner wall of the drill bit connector, and the right countersunk bolt abuts against the front portion and the rear portion of the middle connector. And due to the design of the left spring and th