The utility model provides a building construction is with well tube formwork board, including connection pad, hoist cable, a support section of thick bamboo, electro -magnet, drag hook, spring and connecting strip, the connection pad top install the hoist cable, the connection pad be equipped with electro -magnet mounting hole and drag hook mounting groove, the even distribution of drag hook mounting groove around the electro -magnet mounting hole, electro -magnet mounting hole and drag hook mounting groove be linked together, electro -magnet mounting hole and drag hook mounting groove be about communicating hole, the electro -magnet pass the electro -magnet mounting hole and install in the electro -magnet mounting hole, the drag hook include jack catch, lower positioning pin, go up locating pin and locating pin mount table. The utility model has the advantages of the dismouting is nimble, convenient to use, import construction back is accomplished to ground well well tube formwork board, can realize making the template quick from import department's separation and take out, improves the work efficiency of building construction, the utility model discloses be applicable to still that the bridge punches, the ground punches.