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There are planes with different heights in the inner groove of the ceramic shell of the temperature control relay, and they all have mounting holes. This article is aimed at the ceramic shell of the temperature control relay with two planes at the bottom,A method of multi-angle laser adaptive measurement of inner groove depth based on part angle pre-recognition was studied. The method uses a multi-laser ring optical path structure, eight independently controllable line lasers are equidistantly mounted on the ring support. First detect the rotation angle of the part in real time by taking a picture. Then automatically find the laser in the right direction and turn it on, it forms parallel segmented facula on each plane of the inner groove. Then the distance between facula is transformed into the depth of inner groove by laser triangulation. This method can automatically select a suitable angle of laser irradiation according to the placement of parts. Therefore, there is no need to manually place parts, and the area that interferes with laser imaging can be automatically avoided. The experimental results show that the measurement results of this method are accurate and reliable, and the measurement error is less than 0.01mm.