The invention discloses a spiral flow strong suction type reverse circulation coring drill bit. A built-in pipe is inserted in an inner cavity of a drill bit body. A plurality of spiral protrusions are arranged on the periphery of the built-in pipe. Spiral channels are formed between the adjacent spiral protrusions. The spiral protrusions are closely matched with the wall of the inner cavity of the drill bit body. An outer shoulder is arranged at the bottom of the built-in pipe and provided with a positioning block. An inner shoulder is arranged on the portion, corresponding to the outer shoulder, of the wall of the inner cavity of the drill bit body. The inner shoulder is provided with a positioning groove. The positioning groove can be fixed to the positioning block on the outer shoulder in a matched mode. The outer shoulder and the inner shoulder are connected in a clamped mode through matched fixing of the positioning groove and the positioning block. The drill bit has the advantages that the reverse circulation forming effect can be greatly improved, the technical problem that reverse circulation of breaking and loss stratums can not be formed thoroughly can be solved, and improvement of drilling efficiency of a down-hole hammer and increase of the core or rock sample obtaining rate are facilitated.