The utility model discloses an anchor clamps for centre gripping ionization chamber, including base, fixed cover, lifter, sliding block, screw rod, gasket, fixed block, backup pad, reinforcing plate, bracing piece, mounting groove, altitude mixture control button and curb plate, be equipped with fixed cover on the said base, fix the cover both sides and be equipped with the curb plate, fix the distolateral face of putting in and be equipped with the altitude mixture control button, be equipped with the lifter on the fixed cover, said lifter up end is equipped with the mounting groove, and the mounting groove upper end is equipped with the bracing piece, and upper end of the support bar is equipped with the backup pad, is equipped with the reinforcing plate between backup pad and the bracing piece, said backup pad upper end is equipped with the fixed block, and the fixed block left side is equipped with the sliding block, and sliding block and fixed block are equipped with the gasket to the opposite, wear to be equipped with the screw rod on the sliding block, the utility model discloses utilize reinforcing plate and backup pad will install whole focus bracing piece top, and then reduced the moment that the bracing piece received to the potential safety hazard that exists has been eliminated in traditional device.