Acute respiratory distress syndrome (ARDS) is the most common respiratory emergency and one of the most severe clinical syndromes. Bacterial and viral infections are the frequent etiological factors. Pseudomonas aeruginosa (PA) is the most significant gram-negative pathogen associated with pneumonia and ARDS in critically ill patients with respiratory diseases. However, multi-drug resistance and biofilm formation pose significant challenges to the clinical treatment of PA-associated pulmonary infections. In this study, we focused on edaravone (EDA), a brain-protective agent and free-radical scavenger commonly used in neurology, and examined its role in PA-ALI. We found EDA significantly mitigated pulmonary pathological damage, inflammatory responses and Reactive Oxygen Species (ROS) generation induced by PA in vivo. The in-vitro assays revealed EDA inhibited the transcription and secretion of pro-inflammatory factors induced by PA in RAW264.7 cells by targeting the TLR4/MyD88/NF-κB signaling pathways. Additionally, EDA reduced the production of intracellular ROS and cell death. EDA treatment enhanced the transcription of antimicrobial peptides, including defensin beta 1 (Defb1), defensin beta 2 (Defb2), CC motif chemokine ligand 20 (Ccl20), secretory leukocyte peptidase inhibitor (Slpi), and lactotransferrin (Ltf), with a significant upregulation of Defb1 expression. We also explored the role of EDA in lung endogenous stem cells using Sftpc-DreER; Scgb1a1-CreER; R26-TLR mice. Our findings indicated that EDA promoted the regeneration of club cells in response to PA stimulation by promoting their proliferation. And also, EDA inhibited PA infection induced cell apoptosis in lung tissues. In conclusion, EDA acts as a protective agent in PA-ALI. It not only inhibits inflammatory responses induced by PA but also enhances the expression of antimicrobial peptides and promotes club cell regeneration. Therefore, EDA may serve as an adjunctive treatment for PA-ARDS.