Lock catch for fixing keel frame of stone curtain wall

The utility model relates to a lock catch for fixing a keel frame of a stone curtain wall. The lock catch comprises a screw, a straight line screw head, a pressing plate and an extension spring, wherein the straight line screw head is arranged at one end of the screw, one end of the extension spring is fixed at the inner side of the screw head, the other end of the extension spring is fixed at a pressing hole side of the center of the pressing plate, and the block pins are arranged in the recessed surface on both side of the pressing plate. The lock catch is advantageous in that the straight line screw head of the lock catch is inserted into a plate with a straight line hole, and the screw is pushed, so that the straight line screw head is tightly fixed by the plate with the straight line hole. The straight line screw head is at a 90 degree angle to the plate with the straight line hole, so that a fixed component and a nut can be installed on the screw. The component to be fixed can be reliably fixed on the p