Flexible mechanoluminescence optical fiber, preparation method thereof and large-strain sensing application device

The invention discloses a flexible mechanoluminescence optical fiber, a preparation method thereof and a large-strain sensing application device. The flexible mechanoluminescence optical fiber comprises a matrix optical fiber, a mechanoluminescence sensing layer and a protective layer; the matrix optical fiber is of a fiber core-cladding structure and comprises a fiber core and a cladding, whereinthe cladding wraps the fiber core; the mechanoluminescence sensing layer is compounded on the outer side of the cladding of the matrix optical fiber; the mechanoluminescence sensing layer is wrappedby the protective layer; and the mechanoluminescence sensing layer directly generates mechanofluorescence with corresponding intensity under the action of external force without continuous excitationof a power supply or a light source, collects the mechanofluorescence through the matrix optical fiber and transmits the mechanofluorescence to a far end along the matrix optical fiber for detection and demodulation. The flexib