The critical thinking ability is an indispensable ability of contemporary college students, and the PBL teaching model abandons the shortcomings of traditional teaching methods, which is more suitable for the development trend of university curriculum teaching reform in China. In order to understand the influence of PBL teaching mode on college students' critical thinking ability, the research is carried out into English critical thinking dispositions and skills of the second grade English education majors in Jiangxi Province, via questionnaires, interview, English tests and the PBL teaching experiment. And the results indicate that the PBL teaching model can improve such three English critical thinking temperament level as analysis, openness and fair, and it can significantly improve the two English critical thinking skills of analysis and interpretation, but do not improve the English scores of the students significantly. The purpose of this study is to enrich the research into the influence of PBL teaching model on English critical thinking ability, and so as to provide some reference for improving the quality of English teaching in colleges and universities.