The invention relates to the technical field of environment detection, in particular to a coastal zone resource environment bearing capacity evaluation method based on ecological system functions. The method comprises the following steps: acquiring water resource data, soil data, topographic data and covering data of a target area; obtaining an index factor according to the water resource data, the soil data, the topographic data and a corresponding index factor algorithm; according to the index factor and a soil conservation index algorithm, obtaining a soil conservation index of the target area; according to the coating data and a preset corresponding relation between the coating and the carbon density, obtaining the carbon density of the target area, and according to the carbon density and a carbon sequestration index algorithm, obtaining a carbon sequestration index of the target area; according to the water resource data, the soil data, the covering data and a corresponding ecological index algorithm, obtaining an ecological index of the target area; and obtaining an ecological service index of the target area according to the processed soil retention amount index, the carbon sequestration amount index, the ecological index and an ecological service index algorithm.