Soil animals are not only one of most active components of the biome in soil ecosystems, but also are an important part of urban turf ecosystems. The invasion of Trifolium repens L. may result in direct or indirect undesirable impacts on both turfgrass growth and the below-ground soil fauna, which somewhat alter the functions and processes of urban turf soil ecosystem. Therefore, research on the responses of soil fauna to the invasion of T. repens could not only help us to further understand the mechanisms of exotic plant invasion in urban turf ecosystems, but also to provide a practical and theoretical basis for turf establishment and maintenance. In this study, we analyzed the soil animal community structures and the soil physicochemical properties in four sampling areas with varying invasion intensities of T. repens using field investigation methods. A total of 30099 individual soil animals, belonging to 19 orders and 43 families, were collected. Among these soil animals, the dominant families present were Rhabditidae, Enchytraeidae, and Poduridae. The number of soil animal individuals and groups were significantly different and showed the following order among the four sampling areas:moderate invasion > mild invasion > control > severe invasion. This phenomenon is consistent with the intermediate disturbance hypothesis. Furthermore, we found that the number of soil animal individuals and groups was higher in summer and autumn than in spring and winter. A canonical correspondence analysis indicated that ammonium nitrogen concentration was not the environmental limitation factor for soil fauna distribution, which presumably resulted from the nitrogen fixation ability of T. repens. Our results also showed that soil physicochemical factors mainly affected common and rare groups of soil fauna, but had little influence on the dominant groups. In summary, our results demonstrated that the invasion of T. repens with a mild degree increased the diversity of soil fauna. With the increase of invasion intensity, the turf was gradually dominated by T. repens and the plant diversity decreased, which led to a shortage of available resource for soil fauna and resulted in a decline in soil animal community diversity. We hypothesized that the invasion of T. repens would influence the quantity and structure of common and rare groups of soil fauna, and would ultimately affect the community characteristics of soil animals by changing soil physicochemical properties.