The recreation services provided by urban green spaces are an important component of cultural services, which play a significant role in maintaining public health and enhancing the well-being of residents. However, the integration of the recreation services of green spaces into planning decisions still needs to be promoted. Ecosystem service models provide decision support tools for integrating ecosystem services in land use planning. Nevertheless, compared with regulation services, there are few studies on recreation service assessment. This paper developed an assessment model for the supply and demand of recreation services in urban green space, consisting of three sub-models: the default model, the extended model by green space types, and the extended model by population types. The default model can evaluate the balance between supply and demand of recreation services at different scales (raster scale and administrative scale) based on open-source data. The extended models can combine survey questionnaire data and environmental economic methods to calculate supply and demand of recreation services by green space types and population types. This model has advantages in flexible data requirements, connection with relevant policies, and easy operation interface. In addition, this model is combined with environmental economic methods, providing a new approach for the accurate assessment of recreation services and further application in urban planning. Through two cases of Guangzhou and Paris, the results showed that green spaces were mostly distributed in areas with sparse population, therefore, a large number of people in both Guangzhou and Paris was in a deficit of recreation services. Furthermore, vulnerable groups such as the elderly may face a more extensive deficit, and the preferences for green spaces varied by different social groups need to be fully considered in future planning.