Semi-arc beam type miniature tension sensor

The utility model belongs to the technical field of tension sensors, and particularly relates to a semi-arc beam type miniature tension sensor, which comprises a sensor body, a strain gauge and an outer sheath. The side wall of the sensor body is at least concavely provided with a mounting groove, and the strain gauge is mounted in the mounting groove and clings to the sensor body; the outer sheath is sleeved on the sensor body and covers the strain gauge, and two ends of the sensor body are respectively provided with a wire wheel mounting shaft and a mounting piece; the side wall of the sensor body is at least concavely provided with the mounting groove, and the mounting groove has enough space for mounting the strain gauge, so that the strain gauge cannot protrude out of the sensor body and is prevented from occupying the space outside the sensor body, and the diameter of the miniature tension sensor can be greatly reduced to be within 20mm; the device can be well applied to occasions with limited installat