Improved fine tuning peg for violin and plucked instrument

According to the improved fine tuning peg for the violin and the plucked musical instrument, a planetary reducer is arranged in a cavity at the rear part of a shaft sleeve, an input shaft of the planetary reducer is connected with a knob, a rotating shaft extends into the shaft sleeve, an output shaft of the planetary reducer is connected with one end of the rotating shaft, and the other end of the rotating shaft extends out of the shaft sleeve; a sleeve is arranged on the circular shaft, the shaft section of the rotating shaft between the circular shaft and the shaft sleeve is a string winding shaft, a string penetrating hole is formed in the string winding shaft, and retaining shoulders are arranged at two ends of the string winding shaft. After the tuning peg is installed, a string passes through the string penetrating hole in the tuning peg, and then the string can be rapidly and roughly adjusted by manually operating the shaft sleeve; the rotary knob is rotated, and the planetary reducer drives the rotat