An image-based temperature measurement and sampling gun placing position intelligent detection method and system. The method comprises: collecting a target image, the target image being a molten steel surface image; according to the collected target image, obtaining steel slag seam contour information in a molten steel surface, the contour information comprising inner contours (63, 64) and an outer contour (62) of a steel slag seam; obtaining a steel slag seam width according to the steel slag seam contour information; and matching a preset temperature measurement and sampling gun placing position, a region of interest around the gun placing position, and a minimum region for gun placing with the obtained steel slag seam width, and selecting a gun placing position satisfying a gun placing condition from the molten steel surface to perform temperature measurement and sampling. A distribution condition of steel slag on the molten steel surface of a steel ladle is detected by means of the image, the widths of all the steel slag seams in the preset gun placing region are calculated, the gun placing position satisfying the gun placing condition is selected by means of a predetermined strategy to perform temperature measurement and sampling, thereby improving an intelligent level of temperature measurement and sampling operation of a mechanical arm.
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