Positioning mechanism and preparation equipment for tubular pile

The utility model discloses a positioning mechanism which is characterized by comprising a base, a driving assembly, at least two first clamping pieces and at least two second clamping pieces. The end plate extends into the space between the at least two first clamping pieces, and the driving assembly drives the at least two first clamping pieces to surround each other and clamp the hoop so as to position the hoop, so that the hoop is completely attached to the outer ring of the end plate. When the hoop with the smaller diameter needs to be positioned, the second clamping piece is connected to the first clamping piece, and the second clamping piece can clamp the hoop with the smaller diameter in the process that the second clamping piece and the first clamping piece surround each other. Therefore, hoops with different diameter specifications can be positioned only by disassembling and assembling the second clamping piece, multiple sets of positioning mechanisms do not need to be arranged, and the cost is effe