Supporting steel bracket forming machine and forming process

The invention relates to the technical field of supporting steel forming, and provides a supporting steel support forming machine which comprises a rack. The extrusion blocks are arranged on the rack in a sliding mode, the two extrusion blocks are located on the two sides of the rack correspondingly, and the two extrusion blocks are provided with an arc-shaped first extrusion end and an arc-shaped second extrusion end correspondingly; the abutting block is arranged on the rack, the abutting block is provided with an arc-shaped first abutting end and an arc-shaped second abutting end, the first extrusion end abuts against the first abutting end after sliding, and the second extrusion end abuts against the second abutting end after sliding; and the number of the linear telescopic pieces is two, the two linear telescopic pieces are both arranged on the rack, and after the linear telescopic pieces stretch out and draw back, the extrusion blocks are pushed to slide on the rack. By means of the technical scheme, th