The invention discloses a thermal battery grounding device. The device is composed of a grounding soldering lug and a grounding column. A metal nickel strip which is not easy to deform is processed into the grounding soldering lug, a pipe which is the same as a battery shell is processed into a nut-shaped grounding column, the grounding soldering lug which is bent into a cylinder shape is fixed onthe grounding column by using a spot welding technology, and the grounding column is welded in a blind hole of the battery shell through laser welding. The grounding column can be connected with thegrounding soldering lug and the battery shell, and can also be provided with a screw connected with a protective cover of a protective device on the battery. The problem that the thermal battery grounding wire cannot be connected with the battery shell is solved, and the thermal battery grounding wire can be effectively and physically isolated from an output circuit on a binding post of the battery shell. Tests prove that the connection mode does not loosen or fall off under the mechanical conditions of centrifugation, impact, vibration and the like.