The invention belongs to the technical field of combustible ice exploitation, specifically relates to a combustible ice exploiting drill bit, and comprises a collecting cover, a suction pipe, a fixedrod, a collecting ball and a resistance wire. The collecting cover is bowl-shaped, and is used for gathering methane gas generated by combustible ice; the suction pipe is connected with the collectingcover, and is used for extracting the methane gas gathered in the collecting cover; the fixed rod is located in the suction pipe; the collecting ball is mounted at the bottom of the fixed rod and isused for collecting the combustible ice; and the resistance wire is located inside the collecting ball and is used for heating the collecting ball to melt the combustible ice. The combustible ice exploiting drill bit provided by the invention can continuously and efficiently exploit combustible ice, and the exploiting process is high in safety, and the drill bit is suitable for large-scale combustible ice exploitation.