Gun drill supporting device

The utility model provides a gun drill supporting device which comprises a main shaft component, a positioning device and a supporting frame, the main shaft component is fixed on a supporting plate, the positioning device is arranged at the top end of the supporting plate, a linear guide rail is installed on the positioning device, the linear guide rail is connected with the supporting frame in a sliding mode, and meanwhile the main shaft component is fixed on the supporting frame. One end, far away from the main shaft part, of the supporting frame vertically extends downwards to the same horizontal plane with the central position of the main shaft part, so that the supporting frame is in transmission connection with the main shaft part through a drilling tool. The gun drill tool is supported in the whole process from drilling to finishing, the tool is prevented from being bent and damaged in the high-speed rotating machining process, the hole machining capacity is greatly improved, and the gun drill tool can