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The assessment of climate ecological resources and product value is an important prerequisite for the value realisation of “China Natural Oxygen Bar”, a climate ecological product. However, currently, site-based climate ecological resource assessment indicators still struggle to reflect the refined advantages of local climate resources. In addition, most studies on the climate ecological product value of the “China Natural Oxygen Bar” mainly focus on its climate advantages, with less consideration on its potential ecological service value, and no effective evaluation indices for climate ecological product service value have been established. Therefore, taking Huairou District in Beijing as an example, this article fully utilises remote sensing data and introduces some remote sensing evaluation indicators such as urban heat island intensity, ecological cold source, and vegetation ecological quality for the first time to optimise and improve the climate and ecological resource evaluation index system of “China Natural Oxygen Bar”. Based on the theory of ecosystem services, a natural oxygen bar ecological service value evaluation index system is constructed from the aspects of carbon sequestration and oxygen release, climate regulation, air purification, water source conservation, and soil and water conservation, and the ecological product service value is estimated. The research results show that the introduction of multiple remote sensing evaluation indicators can help more comprehensively and finely evaluate the climate and ecological resources of Huairou; Huairou has the advantages of climate and ecological resources needed to create a “China Natural Oxygen Bar”. The comfortable climate period lasts for 6 months throughout the year, with 81% of days having good air quality. The air is very fresh, with an average negative (oxygen) ion concentration of 2583/cm³ during the comfortable climate period. In summer, it has cool climate resources with an area proportion of up to 90%, and 88% of the region achieves excellent vegetation ecological quality, with forest coverage (77.5%) and vegetation coverage (75.8%) ranking first among 16 districts in Beijing. The net primary productivity (490.2 g/(m²·a)) is 14% higher than the average in Beijing. The established ecological service value evaluation index system can effectively evaluate the ecological service value of natural oxygen bars. The ecological product service value of Huairou’s “China Natural Oxygen Bar” is 14.3987 billion yuan, accounting for 32% of the region’s GDP that year. Among them, the value of forest climate regulation and air purification accounts for 87.2% of all ecological service values. Compared to the average of Beijing, it has significant regional advantages in ecological service value. These results indicate that the newly established climate ecological assessment system can better reflect the value of “China Natural Oxygen Bar” climate ecological products.