The invention discloses an attached resistance strain sensor assembly. The attached resistance strain sensor assembly comprises a sensor body, wherein base plates are installed at both ends of the lower end surface of the sensor body; a heat insulation layer is arranged between the two base plates and covers the lower end surface of the sensor body; an outer cover is arranged above the sensor bodyin a covering manner; the two ends of the outer cover are respectively installed on the two base plates; and a wiring terminal is arranged on one side of the outer cover. The attached resistance strain sensor assembly has the advantages that the sensor assembly can be installed on a structural member through electric welding, so that onsite installation of the sensor assembly can be greatly simplified; effects of a high temperature on the performance of an elastic piece in the sensor body during the welding are reduced, so that output values of a sensor still remain within an expected range,and accurate load measurement values can be further obtained; and the sensor assembly achieves higher reliability and a longer service life.