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建立采煤机摇臂壳体的实体模型，在对其受力分析的基础上，利用有限元方法建立随机振幅载荷疲劳分析模型，分析了采煤机摇臂壳体受载的等效应力状态、安全系数分布、寿命分布，并通过雨流循环计算和损伤累加计算原理计算了壳体的损伤分布等。研究结果表明，壳体大部分寿命被较低应力范围消耗，但高应力范围将对壳体造成主要损伤，而且极少次数的损伤累加即可在高应力范围下造成摇臂壳体的局部失效。“,”The solid model of shearer rocker was established. With the force analysis based on, the model fatigue analysis on shearer rocker was presented under non-constant amplitude load. The stress distribution, safety factor distribution and life distribution were analyzed, and the damage distribution was calculated using rain-flow loop computation and damage accumulation principle. The results indicated that most life of the shearer rocker was consumed by stress in low range;however, the shearer rocker was mainly damaged by stress in large range. Moreover, few times damage accumulation results in the partly failure in stress large range.