传统石油基塑料难以降解且污染严重。聚乳酸塑料作为生物基可降解塑料的典型代表，近年来得到广泛应用。尽管聚乳酸塑料可被微生物自然降解，但其降解产物难以有效利用，造成资源浪费。热解技术可将聚乳酸转化为小分子化合物，形成气态、液态和固态产物，实现资源化利用。文章综述了近年来国内外聚乳酸热解的研究现状，总结了聚乳酸的热解特性、热解机理和共热解等方面的研究进展，指出后续应加强PLA原料特性、热解条件、产物特性及应用之间的联系，并针对PLA塑料和石油基塑料共热解的协同作用进行研究。

Conventional petroleum-based plastics are difficult to degrade and cause severe pollution. Polylactic acid (PLA) plastics, as a typical representative of biodegradable plastics derived from biological sources, have been widely applied in recent years. Although PLA plastics can be naturally degraded by microorganisms, the degradation products are hard to utilize effectively, leading to resource waste. Pyrolysis technology can convert PLA into small molecular compounds, forming gaseous, liquid, and solid products, thus achieving resource utilization. The article reviews the research status of PLA pyrolysis at home and abroad in recent years, summarizes the research progress on the pyrolysis characteristics, pyrolysis mechanism, and co-pyrolysis of PLA, and points out that the connection between PLA raw material properties, pyrolysis conditions, product properties, and applications should be strengthened in the future, and the synergistic effect of co-pyrolysis of PLA plastics and petroleum-based plastics should be studied.