The invention relates to the technical field of drill bits, in particular to a three-wing coreless alloy drill bit, which comprises a tool bit, a drill bit body and a connecting part, the tool bit isfixedly connected with one end of the drill bit body, the connecting part comprises a connecting shaft, a sleeve, an annular end cover and a long rod bolt, wherein a plurality of rings of alloy wire are wound on the outer side of the connecting shaft; the sleeve and the connecting shaft are coaxially arranged; the inner diameter of the sleeve is equal to the sum of the diameter of the connecting shaft and the thickness of the alloy wire; a limiting groove is formed in the tail part of the connecting shaft; a plurality of bolt connecting holes are formed in the limiting groove; a limiting bossand a plurality of bolt limiting holes are formed on the annular end cover; the limiting boss is positioned in the limiting groove; the number of the bolt connecting holes and the number of the bolt limiting holes is equal; the positions of bolt connecting holes correspond to the positions of the bolt limiting holes. The annular end cover and the connecting shaft are fixedly connected through a long rod bolt. The drill bit is simple in structure and reasonable in design, forming a plurality of small blocks after the connecting shaft is cracked is avoided, and the drill bit with a cracked connecting shaft is convenient to take out.