The invention discloses a low-magnetism fixing bottom plate for wall penetrating casing pipes. The low-magnetism fixing bottom plate comprises a bottom plate body which can be fixedly installed in a wall and used for fixing the wall penetrating casing pipes. The bottom plate body is composed of a whole rectangular low-magnetism steel plate. Three holes for the wall penetrating casing pipes to be inserted and connected therein are formed in the surface of the bottom plate body in the longitudinal direction, and the circle centers of the three holes are located in the same straight line. At least three screw holes are evenly distributed in the periphery of each hole, and the screw holes are provided with bolts used for fixing the wall penetrating casing pipes. Three bolts used for connecting shells of the wall penetrating casing pipes to the ground are welded below the three holes respectively. Four screw holes are evenly distributed in the periphery of each of the three holes. The holes are round holes matched with the wall penetrating casing pipes, and positioning concave grooves are symmetrically formed in the upper sides and the lower sides of the round holes. A rectangular slot used for welding of a bottom plate grounding flat iron is formed in the lower left side of the bottom plate body. The low-magnetism fixing bottom plate has the beneficial effects that the installation structure is simple and firm, use is convenient and reliable, the use temperature can be effectively lowered, and safety operation of a power grid is ensured.