The invention discloses a processing technology of a PCB stepped slot. The processing technology at least comprises a drilling step, an electroplating step, an outer layer image manufacturing step, a solder resist coating step, a character layer processing step, a surface processing step and a molding step, wherein after the drilling step and before the electroplating step, a stepped slot hammering step is performed. According to the processing technology of the PCB stepped slot, the stepped slot hammering step is before the electroplating step, the outer layer image manufacturing step and the solder resist coating step, the influence of the board such as the copper thickness, the solder resist thickness and the character thickness can be eliminated, the depth of the hammered stepped slot can be controlled more easily, and the accumulative error of the stepped slot can be lowered, so that the deviation of the stepped slot can be accurately controlled within 0.05 mm, and the product yield can be greatly increased.