The invention discloses a Mach-Zehnder interferometer, and manufacturing equipment and method thereof. The Mach-Zehnder interferometer is a fiber-core-modulated biconical micro-nano chirp long-periodfiber grating which is formed through fiber Bragg grating tapering and provided with a middle beam waist. The manufacturing equipment of the Mach-Zehnder interferometer comprises a light source, a stretching moving table, an oxyhydrogen flame tapering machine and an optical spectrum analyzer. The manufacturing method comprises the steps that a surface coating layer of a cut-out fiber Bragg gratingwith the set length is removed; the two ends of the fiber Bragg grating are fixed to two working tables of the stretching moving table correspondingly; the broadband light source is connected into one end of the fiber Bragg grating, and the optical spectrum analyzer is connected into the other end of the fiber Bragg grating; and fusion parameters of the oxyhydrogen flame tapering machine are set,the fiber Bragg grating is sprayed simultaneously, the two working tables of the stretching moving table are moved towards the two sides, and the Mach-Zehnder interferometer is formed after high-temperature annealing. The manufacturing method is simple, the cost is low, and the broadband of the Mach-Zehnder interferometer can be tuned.