The process of producing palm oil produces oil palm waste in the form of shells, fiber and abundant empty palm bunches. Most oil palm industrial waste is piled up in the industry and is usually only used as landfill or simply burned. thus to reduce palm oil waste the drying process is carried out, where the drying process aims to make oil palm waste as a renewable energy source. The process of drying oil palm waste in the form of shells, empty bunches, and fiber using microwave ovens and conventional ovens. The drying process is carried out to determine the effect of moisture content, mass flow rate, constants constant rate and decreasing constant rate on shells, empty bunches, and palm fiber. From the results of research on drying of shell, fiber, and empty bunches of oil palm waste, it was found that shells had the highest density compared to fibers and empty bunches, so the shells had the lowest mass flow rate compared to empty fibers and bunches, this was also affected temperature and drying tool, where the higher the temperature the faster the drying process, and using a microwave oven will be faster than conventional ovens, so the constant drying rate constant will be greater and the constant drying rate will also decrease