A novel interrogation technology with the function of real-time monitoring for fiber Bragg grating (FBG) sensor system based on a ring-cavity fiber laser, and a 1×4 analog electronic switch is reported. A cascaded wavelength-division-multiplexed FBG sensor array is acted as the reflector of the laser. Letting signal light obtain sufficient gain by adjusting the optical route and increasing the intensity of pump light, then laser pluses working at Bragg wavelength of each element will output orderly by introducing the technique of wavelength scanning with a tunable Fabry-Pérot filter. A 1×4 analog electronic switch is employed. The laser pluses are allocated to 4-output channels in time-sequence. Demodulated with an unbalanced Michelson scanning interferometer, a 4-element array is addressed successfully. Working with a wavelength of 1555 nm, the system is demonstrated to be with a sensing sensitivity of 1.630°/με, which agrees with the theoretical value of 1.674°/με.