The invention discloses a mechanical mold part machining welding operation table capable of adjusting the welding position in real time, which comprises a base, two groups of adjusting grooves are formed in the inner side of the base, a transmission rod is mounted on the inner side of the base in a penetrating manner, the transmission rod penetrates through the interiors of the two groups of adjusting grooves, and two groups of transmission rollers are mounted on the outer side of the transmission rod. The transmission roller is located on the inner side of the adjusting groove, and a conveying belt is movably installed on the outer side of the transmission roller. The movable inner pipe is installed, a motor is controlled to operate to drive a driving wheel at the output end to rotate, the driving wheel rotates to drive a transmission belt on the outer side to rotate, the transmission belt rotates to drive a driven wheel on the inner side to rotate, and the driven wheel rotates to drive the movable inner pipe on the inner side to rotate on the inner side of a fixed outer ring; the movable inner pipe rotates to drive the adjusting rod and the clamping plate on the inner side to rotate, the clamping plate rotates to drive the tubular workpiece on the inner side to rotate, the device can conveniently and automatically adjust the angle of a welding seam during welding, and the workpiece is comprehensively welded.