Pre-drilling device for vibroflotation gravel pile construction

The utility model discloses a pre-drilling device for vibroflotation gravel pile construction. The pre-drilling device comprises a stand column and a rack. A top plate is fixedly installed at the topof the stand column, the upper portion of the stand column is sleeved with a rotating sleeve, the rotating sleeve is rotationally connected with the stand column, the rack is transversely and fixedlyinstalled on the outer side of the rotating sleeve, a screw is rotationally installed at the bottom of the rack, the screw is in threaded connection with a threaded sleeve, and the upper side of the threaded sleeve is in sliding connection with the rack. An electric push rod is fixedly installed on the lower side of the threaded sleeve, a drilling motor is fixedly installed at the telescopic end of the electric push rod, and a drill rod is fixedly installed at the output end of the drilling motor. The rotating sleeve is arranged on the upper portion of the stand column in a sleeving mode, theposition of the drill rod i