Drill bit of cement-soil mixing pile machine

The utility model provides a drill bit of a cement-soil mixing pile machine. The drill bit comprises a center drill bit assembly connected to the lower end of a drill rod of the pile machine. The center drill bit assembly comprises a cone claw connected with the bottom end of a pile machine drill rod, a cone hinged to the lower portion of the cone claw and inserted teeth arranged on the outer surface of the cone. The cone claw is also provided with a slurry conveying channel which is through up and down; the lower part of the cone protrudes towards the outer side of the lower part of the cone claw; the pile machine drill bit further comprises an inner blade assembly connected to the outer side of the cone claw and an outer blade assembly connected to the tail end of the inner blade assembly. The utility model has the advantages of simple and reasonable structural design, good adaptability to gravel-cobble strata, good rigidity, strength and wear resistance and long service life, can effectively improve the wo