The utility model relates to a servo control circuit. The circuit comprises a first power supply, a capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first transistor, a second transistor, a first diode, a second diode and an electric motor. The capacitor and the fifth resistor form a starting circuit to allow the first transistor to be conducted and then the electric motor to start. By selecting a sixth resistor with proper resistance, the base electrode-emitter voltage of the second transistor is equal to the cathode voltage of the first diode. The circuit allows stability of motor rotating speed control precision to be greatly improved, utilizes integrate components and reduces size of the control circuit device.