Electric screw driver with clutch and torque measuring module thereof

A torque measuring module is disclosed in the present invention. The torque measuring module is applied to an electric screw driver and includes a fixed outer barrel, a planetary gearbox, a shaft, and a torque measuring assembly. The fixed outer barrel is between a motor and a clutch. The planetary gearbox connects to the clutch. The shaft connects to the motor and the clutch along an axial direction. The torque measuring assembly is utilized to measure a shear force and a torsional deformation generated by the planetary gearbox and is utilized to calculate an output torque from the planetary gearbox to the clutch. An electric screw driver with a clutch and the torque measuring module is also disclosed in the present invention.