The invention provides a building support frame wall corner lock. The building support frame wall corner lock comprises a flat plate, a folded plate and a wing plate. The flat plate and the folded plate are formed integrally and divided by a crease, the wing plate is perpendicular to the folded plate, and is a triangle with the side edge of the folded plate being the bottom edge, the inner side edge of the wing plate is parallel to the flat plate, the middles of the plate surfaces of the flat plate and the folded plate are provided with through holes, and an elbowed bolt is arranged on the through hole of the folded plate; an T-head bolt is arranged on the through hole of the flat plate. The invention further provides a production method of the building support frame wall corner lock. The method comprises the steps of cutting a metal plate according to the shape, and then obtaining a main lock body of the lock through simple folding, wherein an elbowed bolt fixing support and a T-head bolt fixing support are provided. The body structure of the building support frame wall corner lock is constituted of the plate, an initial shape can be cut at one time with the metal plate, the lock is produced through simple folding, and there is no need to cut a steel pipe and then to weld a finished product in an original technology. The production process is very convenient, the production speed is remarkably increased, a single layer of the plate is far smaller than the pipe, and materials are greatly saved.