The utility model provides a hydroelectric set allies oneself with axle bolt and extracts mechanism, it is main includes two up and down segments separately be provided with respectively the external screw thread the stand and through the connection borehole jack of both sides put stand top and each with the fixed company's board of nut, company board below dispose one can be with linking the jack that the board made progress jack -up, stand hypomere external screw thread dispose one at least and take the internal screw thread shaft coupling to it has the upper segment to have the extra long pillar of external screw thread to meet through this shaft coupling, extra long pillar under the tip be provided with one end and wear the sunken hole of internal thread and connect through this sunken kong kexuan and go up or make progress the column of wearing out physically through the pillar that will extend from dismounting bolt hole lower part in dismounting bolt not, company's board by with the corresponding interior arc company board of axle bolt even institute department's arc radian to the arc even is provided with inside bellied enhancement chimb in the middle inner arc limit of inboard side in it, it has simple structure, convenient operation, use safe and reliable, can improve characteristics such as efficiency of construction and reduction intensity of labour.