Electric thread detector convenient for measuring internal thread

The utility model belongs to the technical field of thread detection, and discloses an electric thread detector convenient for measuring internal threads, which comprises a motor, a transmission assembly and a testing fixture clamping joint, and is characterized in that the motor drives the testing fixture clamping joint to rotate through the transmission assembly; the transmission assembly comprises a first transmission part, a second transmission part and a torque limiting clutch connected between the first transmission part and the second transmission part, the torque limiting clutch comprises an elastic part and a clutch part, the clutch part is driven by the first transmission part to rotate and is axially installed on the first transmission part in a sliding mode, the elastic part extrudes the clutch part, and the clutch part is driven by the second transmission part to rotate. Therefore, the clutch piece and the second transmission piece keep torque transmission under the rated torque. When the torque