Due to urbanization and rapid growth in population, it results in a substantial increase in municipal solid waste (MSW). This problem can cause a serious threat to human health and the environment. Therefore, an efficient way to dispose of MSW is needed. Burning MSW is one of the promising choices for disposing of MSW. However, MSW is not suitable for combustion yet. Hence, an improvement of the quality of MSW is required. Torrefaction (low-temperature activation) of MSW using microwave irradiation is one of the efficient techniques to improve the quality of MSW. Thus, it was the main purpose of this research to study the torrefaction of MSW. MSW samples with initial moisture content of 40% were terrified using microwave irradiation with the microwave powers of 500-800 W. Carbon powder in the amount of 20-40% was added to enhance the absorption of microwave irradiation. From the experiments, it was found that the remaining amounts of moisture and volatile matter decreased with time. Heating values of the torrefied MSW samples were higher than that of the initial MSW. An increase in the initial moisture content of the sample resulted in a decrease in the remaining amount of volatile matter of the torrefied MSW samples. Additionally, from the TGA curve of the torrefaction of MSW using microwave irradiation at the microwave power of 500 W, it was found that a sharp decrease in mass of the samples occurred at the temperatures between 90-150 °C. However, it was found that, for the microwave power of 800 W, a sharp decrease in mass of the samples occurred twice at the temperatures between 90-150 °C and between 180-230 °C