To reduce the power consumption of a micro-fluxgate, we propose the use of a striped array iron core, which reduces the demagnetization coefficient, to reduce the optimum excitation current of the micro-fluxgate. The power consumption is reduced since it is mainly determined by the optimum excitation current. The finite-element electromagnetic simulation software Magnet and the computing software MATLAB are used to jointly establish the fluxgate model to analyze the effect of the striped array iron core on the optimum excitation current of the micro-fluxgate, and the relationship between the structure of the striped array iron core and the optimum excitation current is obtained. Striped array iron cores with different structures are designed by micro-electromechanical technology. Finally, by comparing the experimental results with the simulation results, the validity of the simulation relationship is verified, which provides a theoretical and experimental basis for reducing the power consumption of the micro-fluxgate by changing the structure of the iron core.