The utility model discloses a wall-protecting mold board for artificially excavating an electric pole pit. The wall-protecting mold board comprises a plurality of fan-shaped unit boards with large size on top and small size at bottom, wherein the plurality of the fan-shaped unit boards are embedded and encircled to form a circular truncated cone shape with large size on top and small size at bottom, a 7-shaped fitting groove is formed in the longitudinal edge of each fan-shaped unit board, the cross section of the matching surface of two adjacent fan-shaped unit boards are Z-shaped, and a handle is arranged on the large end surface of each fan-shaped unit board. According to the wall-protecting mold board for artificially excavating the electric pole pit, the plurality of the fan-shaped unit boards are embedded and encircled to form the circular truncated cone shape with large size on top and small size at bottom, the 7-shaped fitting groove is formed in the longitudinal edge of each fan-shaped unit board, and the handle is arranged on the large end surface of each fan-shaped unit board, therefore, the wall-protecting mold board can achieve a wall-protecting effect by the plurality of the fan-shaped unit boards when the quick-sand electric pole pit is artificially excavated, and the fan-shaped unit boards can be removed from the electric pole pit by the handles for repeated use after an electric pole is assembled.