The utility model discloses a profile modeling anti -drop shape negative pressure anchor clamps of preapring for an unfavorable turn of events, including the anchor clamps seat, the upper end of anchor clamps seat is connected with cell -phone shell copying fixture, and cell -phone shell copying fixture's front is equipped with the negative pressuren zone on the corresponding position of battery compartment, is equipped with the negative pressure groove that a plurality of intervals set up on the negative pressuren zone, because the shape of cell -phone is changeable, but the shape of its battery compartment is all comparatively close, and its area is also great. So it fixes to utilize this part regional adversary's casing. And the air can follow and taken out through negative pressure connector, and through the negative pressure, the cell -phone shell can steadily be fixed on cell -phone shell copying fixture. And the negative pressure joint is established between two branchings, can protect the negative pressure to connect, prevent to touch the negative pressure and connect when the cell -phone shell is got to the dress. The air between cell -phone shell and the cell -phone shell copying fixture can be extracted by furthest to setting up of negative pressure groove, realizes the cell -phone shell and firmly fixes. The utility model is used for the cell -phone shell is polished.