In order to analyzes the influence of the polypropylene fiber recycled concrete beam crack resistance and the ultimate bearing capaci-ty,the paper undertakes the flexural test and comparative analysis of the ten beam components,indicates by the result that the polyprophlene fi-ber can promote the concrete crack resistance performance obviously,concludes the discrepancy between the ultimate flexural bearing capacity of the components and the factual measured value is less than 2% by adopting the regular calculation,and proves the regular formula is feasible.%为了分析聚丙烯纤维对再生混凝土抗裂性能和极限承载力的影响，对10根梁构件进行了受弯试验及对比分析，结果表明：聚丙烯纤维提升混凝土抗裂性能效果显著，同时采用规范公式计算得出了构件极限受弯承载力与实测值相差小于2%，证明了采用规范公式计算的可行性。
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