Microplastic pollution in the soil has become a growing public concern globally. The application of livestock and poultry manure compost is considered to be an important pathway for the accumulation of microplastics in soils. However, the understanding of microplastic pollution in fecal compost is still limited. In this study, the distribution characteristics of microplastics in composts of commercial chicken, cow, goat, and pig manure in four provinces of China were investigated. Microplastics in manure composts were extracted by sieving and digestion with Fenton’s reagent, and their color, size, shape, type, and abundance were further analyzed. The results show that transparent, black, red, and blue are the dominant colors of microplastics in manure composts. The shapes of microplastics in manure composts include fibers, fragments, films and granules, with fibers being the highest. The dominant size of …