The present invention relates to a stereolithographic three-dimensional printer including: an optical engine emitting image beams; a radiation intensity receiving unit arranged at a position separated at a predetermined distance from the optical engine and having multiple radiation intensity sensors arranged at a position where a three-dimensional artwork is outputted and receiving the image beams; and a control unit generating the image beams for measuring radiation intensity using the optical engine, evaluating the deviation of the radiation intensity within a projection plane based on radiation intensity data per measurement positons measured by the radiation intensity receiving unit, and correcting the radiation intensity of the image beams emitted from the optical engine per section of the plane based on the evaluated deviation of the radiation intensity. In addition, the present invention provides a radiation intensity measuring method of the stereolithographic three-dimensional printer and a radiation intensity correcting method. According to the present invention, the measurement and correction of the radiation intensity are efficiently performed at high precision.
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