National parks are the core carriers for implementing the concept of “ecological protection first, public welfare for all”. This study used the fuzzy comprehensive evaluation method to evaluate the ecological experience resource quality of the Laohegou area in Giant Panda National Park of China. Based on the standardized psychological assessment scale and the Kessler Psychological Distress Scale, we have established an evaluation model for the psychological health benefits, quantifying the psychological health benefits of tourists in the ecological experience of national parks. At the same time, the relationship between the demographic characteristics, ecological experience characteristics, psychological health level, and psychological health benefits of visitors was analyzed. The ecological environment in Laohegou area is excellent (evaluated as “excellent” in multiple key indicators), with outstanding resource and value characteristics (evaluated as “good” in multiple indicators), and has the ability to provide high-quality public ecological experiences, which has significant benefits in promoting tourists’ mental health. The ecological experience within national parks could bring high psychological health benefits to visitors. The educational background, age, and income of visitors had a significant impact on the psychological health benefits of their ecological experience. Therefore, ecological experience products within national parks should be designed in layers based on age, income, and other factors, and spaces should be controlled at different levels.