The invention relates to a guide device, comprising a connecting piece, a first clamping piece and a second clamping piece. The first and second clamping pieces are connected with the connecting piece, at least one of the first and second clamping pieces is rotatably connected with the connecting piece; one end of the first clamping piece is provided with a first groove and a first containing groove communicated with each other; one end of the second clamping piece is provided a second groove and a second containing groove communicated with each other; the first and second grooves are combined to form a channel communicated with the outside of the guide device; the first and second containing grooves are combined to form a containing part communicated with the outside of the channel; and the containing part is provided with an opening communicated with the outside of the guide device. The guide device has the advantage of avoiding screw reversal.