The utility model discloses a tight drill jig of quick clamp of brake adjustment arm casing before automobile, comprises a base, the supporting seat, the rotation axis, first removal frame, the secondremoves frame and positioning mechanism, wherein first removal frame and second remove and erect on the base, the rotation axis is worn to establish and remove frame looks spiro union on first removal frame and second removal frame and with first removal frame and second, on removing and put up, first removal frame and second be provided with opposite direction's helicitic texture, be provided with on the rotation axis and remove upward helicitic texture assorted screw rod structure of frame with first removal frame and second, axis of rotation's in -process can drive first removal frame andsecond and remove that the frame goes on in opposite directions or opposite the removal, the supporting seat is established and is removed between the frame and fix on the base at first removal frameand second, beneficial effect: effectively improve drilling accuracy, the both ends of rotation axis are provided with opposite direction's helicitic texture, realize removing moving in opposite directions or on the contrary of frame to the realization is to the fastening of processing part with lax.