The invention discloses a main reinforcement loading device for a roll seam welding machine for a steel reinforcement framework. The main reinforcement loading device comprises a main support, an auxiliary support, a loading mechanism and loading hooks, wherein the main support is connected with the auxiliary support through a cross brace; a motor plate is arranged at the lower end of the main support, and a support seat I is arranged at the upper end of the main support; a support seat II is arranged at the lower end of the auxiliary support, and a support seat III is arranged at the upper end of the auxiliary support; the loading mechanism is composed of a motor, a rotary shaft I, a rotary shaft II, a rotary shaft III, a mounted bearing and a chain; the rotary shaft I is rotationally connected with the support seat II; the rotary shaft II is rotationally connected with the support seat I; the rotary shaft III is rotationally connected with the support seat III; a chain wheel I is arranged on an output shaft of the motor; a chain wheel II is arranged on the rotary shaft I; a chain wheel III is arranged on the rotary shaft II; a chain wheel IV is arranged on the rotary shaft III; the chain wheel I is connected with the chain wheel III through the chain; the chain wheel II is connected with the chain wheel IV through the chain; and the loading hooks are hinged to a chain pin ofthe chain, and equidistantly arranged along the chain. Automatic main reinforcement loading is realized and bending during main reinforcement loading is prevented, so that the manual loading operationis more time-saving and labor-saving.