Scale management has become an essential form of modern agricultural production. However, it is still unclear how farm size influences farmers' pesticide packaging waste recycling behavior (FPPWRB). Based on the data from the China Rural Revitalization Survey 2020, this study quantitatively explores the impact of farm size on FPPWRB. This study found that (1) the ratio for FPPWRB is low, with only about 41.7% of the sample farmers expressing participation in recycling. (2) The empirical results show that for every 1% increase in farm size, the probability of FPPWRB increases by 3.59%. (3) Farmers in urban suburbs or younger farmers are more inclined to FPPWRB. (4) Farm size can improve FPPWRB by enhancing farmers' environmental cognition levels. The research in this study provides insights into the improper disposal of pesticide packaging waste and offers references for formulating policies related to the resource utilization of pesticide packaging waste. Thus, the findings of this study can help provide a reference for the introduction of policies to manage pesticide packaging waste, which, in turn, can help promote sustainable agricultural development.