Trichoderma spp. have been widely used in agricultural applications due to its well known biological control mechanism. The usage of this microbial inoculant in Trichoderma -based products attracts the attention of researchers to discover more on other potential benefits of Trichoderma spp. Hence, through research work from worldwide researchers, we present the success of Trichoderma spp. relate to plant diseases, plant growth, decomposition process and bioremediation. Plus, their secondary metabolites production in agroecosystem will also be reviewed in this paper. These surprising findings bring enormous advantages to the agriculture industry in order to apply environmentally friendly agriculture practices.