Abstract: A microbial decontaminator device for decontaminating herbal and/or pharmaceutical products, the said decontamination device comprising of a microwave oven provided with two slots, one on a front face and the other on a rear face of the microwave oven, a conveyor belt passing through the microwave oven through the two slots and provided with a driving means for driving the conveyor belt, said driving means being coupled to a computer which controls the driving means and in turn, the conveyor belt, the assembly of the microwave oven, the conveyor belt and the driving means being covered by a shielding cage to prevent leakage of microwave radiation to atmosphere, a feed hopper provided behind the rear face of the microwave oven and the conveyor belt for feeding the product to be decontaminated, and an output chute being provided below the conveyor belt and in front of the front face of the microwave oven for collecting the decontaminated product.