Parallelism detection method and parallelism detection device

The invention relates to the technical field of detection and calibration, and in particular, relates to a parallelism detection method and a parallelism detection device. The parallelism detection method comprises the following steps: providing a standard plane; selecting a target position on a to-be-tested plane, and performing a plurality of circulation steps to obtain a plurality of test distances between the target position and the standard plane; and judging whether the plurality of test distances are equal or not, and if the plurality of test distances are not equal, confirming that the to-be-tested plane is not parallel to the standard plane. The circulation step comprises the steps of rotating the to-be-tested plane by a preset angle, and obtaining a test distance between the rotated target position and the standard plane. According to the method, the accuracy of parallelism detection between the two planes is improved, the influence of human subjective factors on the detection result is avoided, the