Chair back force detection sensor and device

The utility model relates to the technical field of seat detection, in particular to a chair back force detection sensor and device, and the device comprises a cantilever assembly, a stress meter and a connecting structure. The cantilever assembly comprises a first cantilever and a second cantilever which are parallel to each other, and the first cantilever and the second cantilever are used for being vertically and symmetrically connected to the bottom of the detected backrest and supporting the bottom of the detected backrest on the base; the connecting structure is used for connecting the cantilever assembly to a base for detection; more than two stressometers are respectively arranged on the side surfaces of the first cantilever and the second cantilever, and are used for measuring the bearing force of the detected backrest in the tipping state. According to the embodiment of the utility model, starting from the actual stress condition and the main deformation position of the backrest, the double-cantilev