The invention relates to machining equipment and specifically relates to a turning lathe for boring an inner wall of a sleeve; the turning lathe comprises a lathe body, a headstock, a gearbox, a feeding box, a polished bar leading screw, a sliding box, a tool rest and a tailstock and is characterized in that a boring bar is arranged; one end of the boring bar is connected with the tailstock and the other end is provided with a boring tool and a boring tool adjusting mechanism; the tool rest is connected with the tailstock by means of a connecting rod; during use, a stainless steel sleeve is fixed on a three-jaw chuck of the headstock; the boring rod and the tail end are clamped on the tailstock, the turning lathe is started and the headstock of the turning lathe drives a sleeve-shaped workpiece to rotate; the tool rest drives the tailstock by the connecting rod, and the tailstock drives the boring rod which drives the boring tool to perform cutting feeding so as to process the inner wall of the sleeve; and the turning lathe has the advantages of being rational in structure, convenient in operation, high in processing precision and the like.