Abstract: A drill bit sharpener includes a motor assembly and a drill bit grinding assembly. The motor assembly has a motor with a drive shaft to drive the drill bit grinding assembly, which includes a driven assembly, a sharpener housing, a grinding wheel assembly and a bit guide assembly. The sharpener housing is attached to the motor assembly, and the grinding wheel assembly is rotatably mounted in the sharpener housing and is rotated by the driven assembly. The bit guide assembly is mounted in the sharpener housing above the grinding wheel assembly. An adjusting screw in the bit guide assembly is used to adjust the grinding wheel assembly relative to the bit guide assembly. Multiple bit guide holes correspond to the grinding wheel assembly are defined in the bit guide assembly and allow a drill bit to pass through to abut the grinding wheel.