The invention belongs to the field of microwave metallurgy, and particularly relates to a continuous feeding microwave metallurgical furnace and a using method thereof. The microwave metallurgical furnace particularly comprises a furnace body, and further comprises a first containing trolley and a second containing trolley, and a supporting mechanism is arranged below the furnace body; and the center positions of the bottoms of the first containing trolley and the second containing trolley are each provided with a lifting mechanism and a rotating device, a supporting base is arranged above each lifting mechanism, a sealing structure and an object containing table are arranged on each supporting base, a walking device and a corresponding rail are arranged below each lifting mechanism, the position between the furnace body and a furnace cavity inside the furnace body is filled with a modularization high-temperature-resistant thermal insulation material, a flue is arranged on the side wall of the furnace body, a cavity is arranged at the upper end of the furnace body, and a cooling hole and a cooling draught fan are arranged on the two sides of the cavity correspondingly. The continuous feeding microwave metallurgical furnace is provided with the two containing trolleys, the first containing trolley is used for smelting, the second containing trolley awaits orders, and the first containing trolley and the second containing trolley are used in turns to complete continuous feeding production, and the waste heat of the furnace body is sufficiently used.