Cast-in-place pile drilling secondary cleaning device

The invention relates to the technical field of cast-in-place piles, in particular to a cast-in-place pile drilling secondary cleaning device which comprises an air injection pipe and further comprises an air outlet pipe and at least one stirring piece, a plurality of air outlet holes are formed in the circumferential direction of the air outlet pipe, and the air outlet pipe communicates with the air injection pipe and can rotate in the axis direction of the air outlet pipe. And the stirring pieces are arranged at the bottom of the air outlet pipe at intervals. The construction requirement that a certain distance exists between an air outlet position and the bottom of a drill hole in the construction process is met through spaced arrangement of the stirring piece and the air outlet pipe, the stirring piece is driven to rotate through the air outlet pipe, and the stirring piece is located at the bottom of the drill hole during construction; and a plurality of air outlet holes are formed in the circumferential