A method for controlling a pot spinning machine, the pot spinning machine including a plurality of spindles (61, 62, 63), each spindle (61, 62, 63) comprising: a drafting device including a pair of back rollers, a pair of middle rollers, and a pair of front rollers that are arranged in that order from an upstream to a downstream of a roving delivery direction, the drafting device being configured to draw out a roving by using rotations of the pair of back rollers, the pair of middle rollers, and the pair of front rollers; a roving-supply stop device configured to stop supply of the roving to the drafting device; and a pot (5, 5-1, 5-2, 5-3) that rotates at a predetermined rotational speed, the method comprising: spinning a yarn supplied from the drafting device in the pot (5, 5-1, 5-2, 5-3) of each of the spindles (61, 62, 63); and rewinding the yarn spun in the pot (5, 5-1, 5-2, 5-3) onto a bobbin; characterized by inspecting each spindle (61, 62, 63) to determine whether a remaining yarn exists in the pot (5, 5-1, 5-2, 5-3) between the end of the rewinding performed after the spinning and the start of next spinning, and starting the roving-supply stop device of at least one of the spindles (61, 62, 63) that is determined in the inspecting as the spindle in which the remaining yarn exists to prevent the yarn from being spun in the pot (5, 5-1, 5-2, 5-3) in the next spinning. a drafting device including a pair of back rollers, a pair of middle rollers, and a pair of front rollers that are arranged in that order from an upstream to a downstream of a roving delivery direction, the drafting device being configured to draw out a roving by using rotations of the pair of back rollers, the pair of middle rollers, and the pair of front rollers; a roving-supply stop device configured to stop supply of the roving to the drafting device; and a pot (5, 5-1, 5-2, 5-3) that rotates at a predetermined rotational speed, the method comprising: spinning a yarn supplied from the drafting device in the pot (5, 5-1, 5-2, 5-3) of each of the spindles (61, 62, 63); and rewinding the yarn spun in the pot (5, 5-1, 5-2, 5-3) onto a bobbin; characterized by inspecting each spindle (61, 62, 63) to determine whether a remaining yarn exists in the pot (5, 5-1, 5-2, 5-3) between the end of the rewinding performed after the spinning and the start of next spinning, and starting the roving-supply stop device of at least one of the spindles (61, 62, 63) that is determined in the inspecting as the spindle in which the remaining yarn exists to prevent the yarn from being spun in the pot (5, 5-1, 5-2, 5-3) in the next spinning. spinning a yarn supplied from the drafting device in the pot (5, 5-1, 5-2, 5-3) of each of the spindles (61, 62, 63); and rewinding the yarn spun in the pot (5, 5-1, 5-2, 5-3) onto a bobbin; characterized by inspecting each spindle (61, 62, 63) to determine whether a remaining yarn exists in the pot (5, 5-1, 5-2, 5-3) between the end of the rewinding performed after the spinning and the start of next spinning, and starting the roving-supply stop device of at least one of the spindles (61, 62, 63) that is determined in the inspecting as the spindle in which the remaining yarn exists to prevent the yarn from being spun in the pot (5, 5-1, 5-2, 5-3) in the next spinning.