The existing research studies have revealed that project-based learning (PjBL) has significantly helped foreign language learners enhance their cultural understanding as a result of completing their projects (e.g., Bouchouk, 2017; Hsu, 2014; Kim, 2019; Liu et al., 2006; Ngo, 2014). While these studies have congruently proved the utility of PjBL in enhancing students’ cultural awareness, none of them has measured the effect of PjBL together with a comparative and contrastive approach on students’ understanding of their home cultures. Hence, the purpose of this study is to investigate the impact of comparing students’ home cultures with the English cultures through PjBL on students’ understanding of their own cultures in terms of cultural products, cultural practices, and cultural perspectives. Two similar intact groups were randomly assigned to control and treatment groups. The two groups were pretested, administered two different treatments for 24 weeks, and post-tested to assess their differences. The independent sample t-tests results exhibited that the experimental group substantially deepened their understanding of their home cultures as a result of comparing them with the English cultures through PjBL. The study also revealed that while the control group significantly improved their cultural products, those in the experimental group greatly enhanced their knowledge of cultural practices and perspectives.