Microplastics are new pollutants that have gradually attracted people’s attention in recent years. As a widely used organic waste treatment technology，composting can degrade microplastics to some extent. At present，there are few studies on the pollution of microplastics in compost，but the harm of microplastics hidden in the compost and entering the soil environment with compost has begun to appear. On the one hand，microplastics can change the microenvironment of compost，affect microbial diversity，and reduce the quality of compost. On the other hand，in the process of composting，the degradation of microplastics may release endogenous toxic substances，and its surface can adsorb heavy metals and organic pollutants，which may lead to compound pollution effect. A systematic review was made on the pollution of microplastics from composting products，the impact on the compost，the degradation of microplastics by composting and the improvement methods. Combined with the degradation of different types of microplastics in composting，the current problems of biodegradable plastics were put forward，and the future development direction of microplastics research in composting was prospected.