The modification of waste FCC catalysts by the impregnation method with sulfuric acid and its catalytic performance in rosin cracking was studied in this paper. The physicochemical properties of the catalyst were characterized by XRD, FT-IR, SEM, and BET. Results showed serious coke deposition and metal ion accumulated on the spent FCC catalyst surface. However, after activation and acid modification, the catalyst remains its Y zeolite bone structure and its layer stripping phenomenon is obvious. The specific surface area and pore volume increase to 149.528 m2⋅g-1, 0.153 cm3⋅g-1 from 88.048 m2⋅g-1, 0.113 cm3⋅g-1, respectively. The FT-IR spectra suggests that the absorption of hydrogen bond is enhanced due to A1-O-H acid sites. The coke deposition, metallic impurities eliminating and the formation of active center are affected by roasted temperature, the mass ratio of liquid/solid, the concentration of sulfuric acid and the drying temperature of waste FCC catalyst. They lead to the different properties of the catalyst. The desirable reaction conditions include a 12%dosage of catalyst, a reaction temperature at 543 K, a reaction time of 1.5 h. After the reaction, the acid value of rosin is decreased to 3.90 mgKOH⋅g-1 from 169.50 mgKOH⋅g-1. The acid-modified waste FCC catalyst showed good catalytic activities for rosin cracking reaction.%采用浸渍法制备了硫酸改性FCC废触媒负载型催化剂，以松香裂解为探针反应进行催化性能研究，利用XRD、IR、SEM和BET对催化剂物理化学性质进行了表征。结果表明，FCC废触媒表面积炭和金属堆积严重，经活化和酸改性后，催化剂保留了Y型分子筛骨架结构，其表面片层剥离现象明显，孔道结构改善，比表面积与孔体积分别由88.048 m2⋅g-1、0.113 cm3⋅g-1增加至149.528 m2⋅g-1、0.153 cm3⋅g-1，FT-IR谱显示氢键吸收峰明显增强形成了Al-O-H酸中心；FCC废触媒改性的焙烧温度、液/固质量比、硫酸浓度和烘干温度影响催化剂积炭、金属杂质的清除和活性中心的形成，导致催化剂性能不同；松香裂解的适宜反应条件是催化剂用量为12%，反应温度为543 K，反应时间为1.5 h，反应后松香酸值由169.50 mgKOH⋅g-1降为3.90 mgKOH⋅g-1，酸改性FCC废触媒对松香裂解反应显示出良好的催化活性。
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