Multi-fiber grating sensor demodulator

The utility model relates to a multi-fiber grating sensor demodulator, which comprises an adjustable fiber laser, a wavelength discriminator, a preceding-stage fiber coupler, an optical isolator, at least four photoelectric detectors, at least four backward-stage fiber couplers, at least four sensor testing ports, a data acquisition card, a computer processor and a display. Each sensor testing port comprises a fiber Prague grating sensor testing port, a chatter fiber grating sensor testing port and a long-period fiber grating sensor testing port. A plurality of fiber Prague grating sensors, a plurality of chatter fiber grating sensors and a plurality of long-period fiber grating sensors can be simultaneously measured on the same sensor demodulator.