The invention relates to the technical field of tea manufacturing machines and especially relates to a microcomputer controlled speed governing device of a tea manufacturing machine. The microcomputercontrolled speed governing device comprises a left support frame, wherein a left support frame reinforcing rib is welded at one end of the left support frame; a driving motor is in screw connection with one end of the left support frame close to the left support frame reinforcing rib; a coupler is in key connection with one end of the driving motor close to the left support frame; a tea manufacturing roller first connecting shaft is in key connection with one end of the coupler far from the driving motor; a tea manufacturing roller is welded with one end of the tea manufacturing roller firstconnecting shaft far from the coupler; a tea manufacturing roller second connecting shaft is welded with one end of the tea manufacturing roller far from the tea manufacturing roller first connectingshaft; a deep groove ball bearing sleeves one end of the tea manufacturing roller second connecting shaft far from the tea manufacturing roller; and a right support frame bearing mounting plate sleeves the outer wall of the deep groove ball bearing. The rotary speed of the tea manufacturing roller can be controlled by manually controlling a speed governor of a speed governing motor, and also the rotary speed of the tea manufacturing roller can be automatically controlled by inputting rotary speed.