The invention relates to an LDCK5150 numerical control vertical lathe headstock mainly comprising a large belt wheel, a headstock body, a gear shaft, a first gear, a first shaft, a second gear, a second shaft, a third gear, a third shaft 21, a fourth gear, a fourth shaft, a fifth gear, a closed cover, a sixth gear, a seventh gear, a rolling bearing, a gland bush, a supporting sleeve, a pressure plate, and the like. The LDCK5150 numerical control vertical lathe headstock has simple, compact and reasonable structure; two ends of the headstock are fixed by a precise rolling bearing due to the adoption of transmission of a straight-tooth gear with high precision; power is input into a first stage by the belt wheel, thus the mechanical noise of a high-speed motor, generated during the gear transmission, is reduced; the processing linear velocity needed by a workpiece can be achieved by adopting multi-staged speed-down, the headstock is singly and circularly lubricated by integral lubricating oil through an oil pump motor, and the regulation of the rotation speed of the worktable is realized through two change gears at the top of a gear-box, therefore, the headstock is convenient to change speed, easy to install and convenient to maintain and can improve the processing efficiency of large-scale wind-powered wind tower flanges and ring forgings and ensure the processing precision.