Proposed is an excavating apparatus including a lower arm having a width that is gradually increased from one end to the other end, and a fixing hole formed in the outer peripheral surface at the other end, a rotational arm stand which is located on the other end of the lower arm, is formed in a disc shape, and is rotatably fixed to the lower arm, an upper arm which is fixed to the rotational arm stand, and has a guide hole in the outer peripheral surface thereof, a center joint which is surrounded by the lower arm, the rotational arm stand, and the upper arm, and is exposed to outside via the fixing hole of the lower arm and the guide hole of the upper arm, and a slip ring which is inserted into or separated from the center joint via the guide hole of the upper arm.