The invention discloses a salvage device and a construction method of a
drill bit of a spin dig
drill. The salvage device comprises a comb-shaped rotating
drill bit, a flat bamboo
cutting type drill,and an anchor type
drill bit; and in the comb-shaped rotating
drill bit, the lower end of a first
high pressure water pipe is connected with a rotating
drill bit barrel body, radially distributed rotating drill bit irons nail or elastic steel wire are arranged on the inner wall or the outer wall of the rotating drill bit
barrel body, the top end of the first high-pressure
water pipe is connected with a
drill pipe, and water outlet holes are formed in the side wall or / and bottom of the rotating drill bit
barrel body. During construction, the comb-shaped rotating drill bit removes drilling slagon the drill bit of the spin dig drill, and the drill bit of the flat bamboo
cutting type drill removes attachment in the drill bit of the spin dig drill; and the anchor type drill bit lifts the drillbit of the spin dig drill. According to the
fishing device and the construction method of the drill bit of the spin dig drill, the drilling
slag in a borehole is cleaned in the early stage by the comb-shaped rotating drill bit and the drill of the flat bamboo
cutting type drill, a passage in the borehole is unobstructed, and the success rate of drill bit salvage of the spin dig drill bit is greatly increased; and the anchor type drill bit adopts an internal bracing structure, the problem of small gap between the drill bit of the spin dig drill and the inner wall of the borehole is solved, andthe success rate of salvage is significantly increased.