The invention provides a spiral tip bit, which comprises a handle part and a bit working part, wherein the handle part is used for clamping and conveying power; the handle part comprises a drillstock and a drill neck; the drill neck is provided with an auxiliary cutting edge and two or three spiral grooves; the bit working part is arranged on the end part of the drill neck; the bit working part comprises a drill point; the end surface of the top end of the drill point is provided with a main cutting edge and a horizontal edge; the diameter of the drill point is gradually reduced to a handle part direction, and the drill point is of an inverse taper shape; the horizontal edge is of an S shape; the middle part of the horizontal edge is higher than the end part of the horizontal edge for 0.8-3mm. According to the spiral tip bit, drilling force can be lowered, and a drilling condition on the horizontal edge is improved, so that axial force is lowered than the axial force of a common twist drill by 15-35%, torque is lowered by 20-30%, durability is improved, the service life of the bit is prolonged, the spiral tip bit has a good automatic centring function, drilling precision and drilling quality can be improved, and the working procedure allowance of finish machining is reduced.