The invention relates to a multi-purpose tenon-and-mortise type spacer device for a pole tower grounding grid and belongs to the field of the construction of the transmission line tower grounding grids of power systems. The multi-purpose tenon-and-mortise type spacer device includes a first grounding grid (1) and a second grounding grid (2) which are arranged at intervals. The multi-purpose tenon-and-mortise type spacer device is characterized in that grounding materials (6) in parallel states in the first grounding grid (1) and the second grounding grid (2) are spaced apart through a verticalspacing component (3); and grounding materials (6) in vertical states in the first grounding grid (1) and the second grounding grid (2) are separated apart through a parallel spacing component (4). According to the multi-purpose tenon-and-mortise type spacer device for the pole tower grounding grid of the invention, the parallel spacing component and the vertical spacing component are adopted, sothat the spacing of the grounding materials in the parallel states and vertical states of the first grounding grid and the second grounding grid can be realized, and the spacing of the first grounding grid and the second grounding grid is realized; and the parallel spacing component and the vertical spacing component are both of tenon-and-mortise structures, and therefore, the reliability of spacing is greatly improved.