According to the change of upper roller diameter,rolling line height of cold rolling mill is adjusted through a tapered-wedge stepped-plate rolling line adjustment unit.Take the Shougang 1450mm UCMW mill as an example,the structure of the adjusting device is introduced in this paper.The relation among stepped-plate and roller diameters is derived with the exhaustive method and extremum method.The result shows the device has compact structure,favorite self-locking,and convenient operation .A reference is provided for the design of other analogical cold-rolling mills.%针对轧机上辊系直径变化后，需要调整轧制线问题，采用了斜楔与阶梯垫复合式轧制线调整装置，本文以首钢1450 mm UCMW轧机为例，介绍了该装置的结构，并利用穷举法和极值法推算出阶梯垫与辊径之间的关系，使用结果表明，其结构紧凑、自锁性好、使用方便，为同类设备中轧制线调整装置的设计提供参考。
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