Drill bit and drill bit assembly

The utility model relates to the technical field of cutting instruments, in particular to a drill bit and a drill bit assembly, the drill bit comprises a drill bit body, one end of the drill bit body is a cutting part, and the cutting part comprises at least two groups of cutting edges; the at least two groups of cutting edges are rotationally and symmetrically distributed relative to the center of the end surface of the drill bit body; wherein any group of cutting edges comprises a chisel edge part used for being matched with the surface of a material to enable the drill bit to penetrate into the material, an edge edge part used for forming the side wall of a drilled hole, and a chip discharging groove; the chisel edge part comprises a chisel edge rear tool face, the chisel edge rear tool face intersects with the side wall of the chip discharging groove to form a chisel edge, and the chisel edge is used for being matched with the surface of a material to achieve cutting; the edge blade part comprises an edge