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An optical fiber microdisplacement sensor based on symmetric Mach-Zehnder interferometer (MZI) with a seven-core fiber and two single-mode fiber balls is proposed.The rationality and manufacturing process of the MZI sensing structure are analyzed.The fabrication mechanism of the Mach-Zehnder sensor by CO2 laser is described in detail.Experimental results show that temperature sensitivities of the two dips are 98.65p/℃ and 89.72pm/℃,respectively.The microdisplacement sensitivities are 2017.71 pm/mm and 2457.92pm/mm,respectively.The simultaneous measurement of temperature and microdisplacement is demonstrated based on the sensitive matrix.The proposed Mach-Zehnder interference sensor exhibits the advantages of compact structure,simple manufacturing process,and high reliability.