The utility model discloses a normal close formula composite construction holder, including dish spring pressure cylinder, double -screw bolt, opening nut, nut, dish spring, fender ring, baffle, key,slip spider subassembly, spring, slips, fore -set, horizontal attachment strap, guard shield, piston, separation jar, U type circle, outer shell, separation jar oil inlet and pressurized cylinder oilinlet. The beneficial effects of the utility model are that: the utility model discloses compact structure, overall dimension are little, satisfy the use of narrower type drill carriage, adopt separation pressure boost combined oil cylinder form, installation and maintenance are more convenient, increase guide support ring among separation and the boosting oil cylinder, avoid fish tail cylinder and piston, increase dish spring protector, prevent that debris from getting into, improve dish spring life, supercharged piston adopts the spherical surface contact form with the slip spider subassembly, prevents to press partially, increase separation jar and pressurized cylinder guard shield, prevent that debris from getting into, improves hydro -cylinder life.