Truss welding steel bar bending device

The invention relates to a truss welding steel bar bending device. The truss welding steel bar bending device comprises a rack, a double-swing-rod power linkage mechanism and a traction mechanism. An upper chain transmission system and a lower chain transmission system which correspond to chain transmission systems are supported on the rack. The outer sides of transmission chains of the chain transmission systems are fixedly connected with traction pins. The bottom of the rack is provided with a transmission shaft in transmission connection with a power device, and the extending end of the transmission shaft sequentially penetrates through driving chain wheels of the two chain transmission systems and is circumferentially fixed to the driving chain wheels. The swing rod power linkage mechanism comprises an upper swing arm transmission shaft and a lower swing arm transmission shaft which are supported on the rack in parallel. The two chain transmission systems are located between the upper swing arm transmissi