The invention discloses a microwave drying device capable of integrating preheating and strong wind heat dissipation. The microwave drying device comprises a belt conveyor, wherein a preheating bin isarranged at the starting end of the belt conveyor, a microwave drying bin is fixedly connected with the preheating bin, and at least one microwave generator is fixed on the upper side of the interiorof a microwave heating box; a spiral distributor is arranged at the joint of the preheating bin and the microwave drying bin, a dehumidification device and an axial flow fan are sequentially connected in series on a heat collection pipe, a strong fan is arranged below the belt conveyor, and a control cabinet is connected with the belt conveyor, the microwave generators, the axial flow fan or thestrong fan. Materials are subjected to drying treatment by adopting a microwave heating technology, and rapid drying of the materials can be achieved through microwaves. According to the microwave drying device, in the process of drying the materials, logistics in the microwave drying bin is timely subjected to heat dissipation and dehumidification, the emitted heat in the microwave drying bin isreturned into the preheating bin, the materials are preheated in the preheating bin, and the energy utilization rate is improved.