To detect the temperature and alcohol concentration during the liquor distillation, a dualparameter optical sensor based on MachZehnder interferometer (MZI) and fiber Bragg grating (FBG) cascade structure is fabricated. The sensor is formed by a 4order FBG which is fabricated by the femtosecond laser with linebyline method in single mode fiber (SMF). The transmitted MZI is based on coreoffset and large overlap splicing method between thin core fiber and SMF. The period of the proposed FBG is 2.2 μm. The Bragg wavelength is 1 591.21 nm. The depth of the transmission spectrum is 23 dB. For MZI, the length of thin core fiber is 8.7 mm and the interference contrast fringe is 28.5 dB. The temperature and alcohol solution concentration features of the sensor are analyzed by beam interference theory. FBG and MZI have different sensitivities to temperature and alcohol solution concentration. The sensitivity matrix is constructed and the temperature and alcohol solution concentration can be measured simultaneously. In the experiments, the sensitivities of concentration of alcohol solution and temperature can reach up to -41.37 pm/% and 58.96 pm/℃. Therefore, the proposed sensing structure has the potential application prospect in the liquor manufacturing industry.