The invention provides a three-roving single-spindle controllable or uniformly controllable feeding spinning device and a spinning method. The three-roving single-spindle controllable or uniformly controllable feeding spinning device is composed of single-spindle spinning devices. Each single-spindle spinning device comprises a rear drawing roller pair formed by a rear roller and a rear rubber roller, a middle drawing roller pair formed by a middle roller and a middle rubber roller, and a front drawing roller pair formed by a front roller and a front rubber roller, wherein three roller sleeves independently driven by independent roller shafts are adopted for the rear roller, and three pieces of roving are fed in through the spaces between the three roller sleeves and the rear rubber roller respectively; roller shafts at all spindle positions are uniformly driven by independent transmission shafts via belts and servo motors or are independently driven by independent servo motors, then three-roving single-spindle controllable or uniformly controllable feeding is achieved, and then single-roving or double-roving or three-roving feeding spinning is achieved, so that the type of yarn is increased, and meanwhile the overall quality of finished yarn is improved.