Four-station numerically-controlled machine tool for milling and grinding ball valve and processing method

The invention discloses a four-station numerically-controlled machine tool for milling and grinding a ball valve. The four-station numerically-controlled machine tool for milling and grinding the ball valve comprises a machine tool body, wherein an X-axis sliding type tailstock box and an X-axis sliding type headstock are slidably mounted along an X axis of the machine tool body; two rotating spindle feeding devices are slidably mounted at two sides of the middle part of the machine tool body in the direction vertical to the X axis; a milling tool, an end surface finishing wheel, a spherical semi-finishing wheel and a spherical finishing wheel are mounted on each rotating spindle feeding device. The four-station numerically-controlled machine tool integrates the spherical milling function, the semi-finishing function, the finishing function, the end surface finishing function and the handle neck grinding function; the four-station numerically-controlled machine tool is compact in structure and small in used a