The invention discloses a backing plate used for PCB drilling. The backing plate comprises a wood fiber base board, a gum impregnated fiber paper lubricating layer adhered to the upper surface of thebase board and a gum impregnated fiber paper reinforcing layer adhered to the lower surface of the base board. The lubricating layer has certain hardness and good functions of lubrication and thermalconductivity, so that flash problems at hole outlets of circuit board drilling can be effectively inhibited; the fiber paper is used as a base material, so that the smoothness and compactness of the resin layer are improved, and the processing performance of drill holes is improved; the reinforcing layer is prepared after the fiber paper formed by papermaking of raw materials such as aramid fibers, basalt fibers, and sisal fibers is impregnated with a resin gum, and the reinforcing layer has a smooth surface and good effects of buffering and thermal insulation, and plays a role of protecting adrilling bit and a table surface; and in a forming process, the upper and lower surface layers of the backing plate are firstly made into semi-solidified states, then the semi-solidified upper and lower surface layers and the base material are subjected to hot press molding, and no additional adhesives are added to the surface layers and the base material, so that adverse influences on drilling by the adhesives are effectively prevented, and the drilling accuracy is improved.