The invention relates to the field of motor equipment, and in particular to a multi-stage speed-regulating transmission mechanism of a motor applied to a fruit picking robot. The multi-stage speed-regulating transmission mechanism comprises a motor box, a No.1 fixing cover, a No.2 fixing cover, a transmission mechanism and a No.3 fixing cover, wherein the motor box is installed on the No.1 fixing cover; the No.1 fixing cover is provided with a connecting arm, a No.1 fixing screw and a No.2 fixing screw; and the No.2 fixing cover is provided with a No.1 mounting groove, a No.1 fixing plate, a No.2 fixing plate, a turn plate, a No.3 fixing plate and a No.1 mounting hole. According to the multi-stage speed-regulating transmission mechanism of the motor applied to the fruit picking robot provided by the invention, a small amount of gears are provided so that the transmission mechanism is simplified, two groups of fixing plates and mounting grooves are designed for adjusting the positions of the gears and rotating shafts so that the motor is used for driving; functions of speed reduction, speed stabilization and acceleration can be realized by utilizing the transmission mechanism; and moreover the structure of a conventional transmission is greatly simplified and the production cost is lowered.