The present invention relates to an automatic alignment system of a 3D printer, and more particularly, having a level sensor and an ultraviolet sensor at the bottom of a build stage supporting an output product, and the height of the tank measured from the level sensor and the ultraviolet sensor and By maintaining the balance between the build stage and the projector by controlling the stage driving unit and the projector driver according to the inclination of the build stage, the balance of the build stage is automatically maintained according to the height from the water tank, The present invention relates to an automatic alignment system of a 3D printer that can improve the completeness of a product output at the bottom of the build stage by adjusting the irradiation range to maintain parallelism between the build stage and the projector irradiating light to the build stage.
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