The invention discloses a microwave heating device used for particle drying. The device includes multiple drying case bodies and a belt conveyor; the drying case bodies are successively connected to each other to form a microwave drying part; the belt conveyor passes through the microwave drying part and is used for conveying materials from the inlet end of the microwave drying part to the outletend of the microwave drying part; the internal of each drying case body is provided with a microwave generator; and the microwave generators are located right above the belt conveyor. The materials are put on the belt conveyor through a funnel; the belt conveyor drives the materials to pass through the microwave drying part formed by the drying case bodies; drying is performed through the microwave generators of the microwave drying part; the materials are output from the outlet end of the microwave drying part and discharged through a discharging part at the tail part of the belt conveyor; and when the funnel discharges the materials on the belt conveyor, a vibration motor can be started to drive the funnel to vibrate up and down, so that the materials in the funnel can be completely discharged from a discharging port.