The invention relates to an automatic machining machine for manufacturing a steel structure truss through stainless steel pipes. The automatic machining machine comprises a base, an automatic feedingmechanism arranged on the base, a displacement mechanism arranged on the base, a clamping bearing table arranged on the displacement mechanism and used for bearing and clamping a steel pipe, two fineadjustment mechanisms fixedly installed on the base in a mirror image arrangement mode, two centering mechanisms and two correction mechanisms arranged in a mirror image arrangement mode. According tothe machine, through mutual cooperation of the automatic feeding mechanism, the displacement mechanism, the clamping bearing table, the fine adjustment mechanism, the centering mechanisms and the correcting mechanisms, complete automatic machining operation can be achieved, synchronous forming machining of the two ends of the steel pipe can be achieved, the automation degree is high, and comparedwith a traditional semi-automatic manual machining mode, the efficiency is greatly improved, and the labor intensity is greatly reduced.