The invention discloses a micro-bit and a processing apparatus using the micro-bit. The micro-bit comprises a bit tip and a bit body, wherein, the bit body is provided with a spiral chip pocket; the bit tip includes a main cutting edge, at least two assistant cutting edges, and at least three subsidiary cutting edges respectively connected with the main cutting edge and the assistant cutting edges. At least two assistant cutting edges are added to substitute the existing one main cutting edge and a main cutting edge is added in the invention, thereby the cutting edge parts of the micro-bit are stressed at more points and the bit tip part of the micro-bit is strengthened in rigidity and not easy to be broken, and the size of the micro-bit can be further reduced on premise of guaranteeing enough rigidity. The processing apparatus using the micro-bit in the invention can ensure the aperture of the drilled hole to be smaller and the processing precision to be higher.