[目的/意义]信息茧房是数字时代亟待破解的顽症。生成式人工智能信息获取既能显著提升用户信息收集的效能，助力信息拓展；又蕴藏信息窄化风险，或导致认知封闭。其潜藏的双刃剑效应亟待系统探析。[方法/过程]立足个体视角，基于认知卸载理论，融合详尽可能性模型与双过程理论，提出“破茧”与“结茧”正负效应路径，依据理论假设构建模型，并使用PLS-SEM展开实证检验。[结果/结论]生成式人工智能信息获取对信息茧房存在双刃剑效应；生成式人工智能信息获取触发的认知卸载既可借由激发用户自我启动行为，拓展信息边界破除茧房；亦可因滋生行为惰性，而加剧信息窄化产生茧房；批判性思维作为关键调节变量，能弱化负向效应，遏制茧房形成。

[Purpose/significance] The information cocoon is a stubborn ailment that must be cracked in the digital era. Information acquisition through generative artificial intelligence can significantly enhance users' information-collection efficiency and help expand information; yet it also harbors the risk of information narrowing, which may lead to cognitive closure. Its latent double-edged-sword effect urgently demands systematic exploration. [Method/process] From an individual perspective, based on cognitive-offloading theory and integrating the elaboration likelihood model with dual-process theory, this study proposes the positive and negative effect paths of "breaking the cocoon" and "spinning the cocoon", constructs a model according to theoretical hypotheses, and conducts empirical testing using PLS-SEM. [Result / conclusion] Generative artificial intelligence information acquisition presents a double-edged-sword effect on information cocoons; the cognitive offloading triggered by generative artificial intelligence information acquisition can, by stimulating users' self-initiated behavior, broaden information boundaries and break cocoons, yet it can also, by fostering behavioral inertia, exacerbate information narrowing and create cocoons; critical thinking, as a key moderating variable, can weaken the negative effect and curb cocoon formation.