In view of the problems of high labor intensity, low production efficiency, and inability to meet the market demand, the quality inspection of high-strength steel bar connecting sleeves in nuclear power is currently completed manually, an intelligent inspection production line for high-strength steel bar connecting sleeves in nuclear power was designed based on the common steel bar connecting sleeves in the market. According to the modular design concept, the overall design scheme of the intelligent inspection production line for steel connecting sleeve was formulated, and the 3D modeling research for each section of the production line was carried out, and the prototype was debugged. The inspection production line realizes the integrated inspection of the structural size, thread profile, pitch, pitch diameter, major diameter and minor diameter of internal thread of the 32 mm steel bar connecting sleeve, with an efficiency of 8 pieces/min, which is about 10 times higher than the traditional manual method. The structure of the production line is reasonable. On the premise of ensuring the inspection quality, the inspection efficiency is greatly improved.