Drilling device for filter tank construction

The utility model relates to the technical field of drilling devices, in particular to a drilling device for filter construction, which comprises a rotary drum and a drill bit drum part, the drill bitdrum part is sleeved at one end of the rotary drum, a plurality of uniformly distributed clamping units are annularly arranged between the rotary drum and the drill bit drum part, and a long plate cavity, a U-shaped plate cavity, a branch pipe cavity I and an annular pipe cavity are formed in the rotary drum. And one side of the long plate cavity is provided with a U-shaped plate cavity, the other side of the long plate cavity is connected with a plurality of branch pipe cavities I which are uniformly distributed, and one end of each branch pipe cavity I is connected with an annular pipe cavity, so that the quick disassembly and combination between the rotary drum and the drill bit cylinder part are realized, the operation is simple, and only the long plate cavity or the U-shaped plate cavity needs to be filled w