While-drilling reaming tool

The invention relates to the technical field of underground reaming, and particularly discloses a reaming-while-drilling tool. The reaming-while-drilling tool comprises a supporting outer barrel assembly, a blade assembly, an expansion mechanism and a return mechanism, the supporting outer barrel assembly comprises a barrel body and a central pipe, the central pipe is arranged in the barrel body, an annular space is formed between the central pipe and the barrel body, a containing groove communicated with the annular space is formed in the barrel body, and a first locking structure is arranged on the central pipe; the blade wing assembly is rotationally arranged in the accommodating groove; the expansion mechanism and the return mechanism can drive the cutter wing assembly to rotate in the first direction and the second direction correspondingly, so that the cutting edge part of the cutter wing assembly has the working state of stretching out of the containing groove and the closed state of retracting into th