Large-aperture drilling slag salvaging device

The utility model provides a large-aperture drilling slag salvaging device. The large-aperture drilling slag salvaging device comprises a rotating rod, a rotating drum, a spiral blade and a fixed transmission mechanism. The rotating rod is arranged in the vertical direction, and the top end can be in power connection with a drilling machine. The rotary drum is coaxially and rotatably connected with the rotary rod and provided with a containing cavity allowing the bottom end of the rotary rod to penetrate through, and at least two feeding structures are arranged at the bottom end of the rotary drum. And the spiral blade can rotate along with the rotating rod so as to upwards transfer rock disintegrating slag entering from the feeding structure. The fixed transmission mechanism is located above the rotating cylinder, arranged on the rotating rod in a sleeving mode, connected with the rotating rod and the rotating cylinder and capable of being fixed to any position of the rotating rod, transmitting power of the