The present invention relates to a hollow drill bit, comprising a drill head having each cutting tooth comprises a plurality of cutting segments arranged in sequence in an axial direction and sequentially towards a radially outer side in a radial direction, forming a stepped structure. Each cutting segment comprises one end segment and one or more circumferential step segments. By the hollow drill bit according to the present invention, cutting forces can be dispersed during drilling, cutting heat and deformation of the cutting teeth can be decreased, and chips can be shunted to thereby prolong the service life of the hollow drill bit.