The small park greenery is an important carrier of the cultural ecosystem services in urban area. Since the outbreak of the COVID-19, this kind of park greenery has become a venue for providing important cultural services and playing irreplaceable benefits for public health. Taking the Guangdong-Hong Kong-Macao Greater Bay Area as the study area, this paper quantifies the cultural services of small park greenery in terms of potential supply and total demand by constructing indicator systems for recreational potential, accessibility and demand of residents, respectively. It also uses spatial autocorrelation and coupling coordination degree models to explore the spatial distribution and matching characteristics of the potential supply and demand of cultural services in the Guangdong-Hong Kong-Macao Greater Bay Area in order to provide scientific support for the management of ecosystem cultural services in the Greater Bay Area. The results are as follows:①the supply of cultural ecosystem services has an obvious gradient distribution, which is generally low in the middle and high in the surrounding areas; the demand of the cultural services is distributed in a contiguous area in the central area of the city. ② The supply of the cultural services is contiguous between cities, with high-high agglomeration, while the demand is low-low agglomeration, with contiguous concentration in the city centers, the dual variables of supply and demand are high-supply-low-demand agglomeration, with concentration around the study area. ③On the whole, about 52.2% of the regions belong to insufficient demand for cultural services, and 5.2% of the regions have insufficient supply. From the perspective of cultural services of small parks and green spaces, the spatial mismatch between supply and demand is more obvious, and the mismatch between supply and demand varies in different regions, which is a comprehensive reflection of the differences in the spatial distribution of regional natural and socio-economic conditions in the Guangdong-Hong Kong-Macao Greater Bay Area. ④It is necessary to identify the natural and geographical distribution, which can be divided into five CES supply and demand matching types:shared region, agglomeration region, balanced region, under-supply region and under-demand region. Among them, the under-demand region of cultural services accounts for 52.2%, and the shared region accounts for 31.6%. There is a certain proportion of mismatch between supply and demand of ecosystem cultural services in the Guangdong-Hong Kong-Macao Greater Bay Area. In order to improve the quality of human life in the process of resisting major emergencies, the natural ecosystem can be managed in a zone manner so as to create a livable urban environment. In the future, the influencing factors of the cultural services of small parks and green spaces should be further explored to promote the quantitative research of human well-being, with the view of provide lessons for the urban system management of the harmonious coexistence between human and nature in the mesoscale urban agglomeration.