Abstract: Lignite can't be utilized on a large scale at present because of its high moisture. The paper describes the low temperature microwave drying equipment for the lignite dehydration. The equipment uses a new solution of microwave heating,which has the advantage of high efficiency ,safety and pollution-free by comparison with the traditional methods. The paper introduces the constitutes and main indexes of the equipment. The design uses the multimode cavity to improve the heating uniformity and heating efficiency ,and the particular design of microwave leakage choker and mesh can minimize the power of microwave leakage. The paper presents a detailed analysis based on microwave theory and simulation, and the results of simulation are shown to confirm the validity of the theory. At last, the working ability and heating uniformity of the equipment are proved by experiments, and have good performance . The research fruits will forward the industry application.