The invention relates to the technical field of silicon iron furnace maintenance equipment, in particular to a device and a method for dismounting lower equipment of a silicon iron furnace. The device used for dismounting lower equipment of the silicon iron furnace comprises a car body, wherein a material stacking rod is fixedly arranged at the front end of the car body; and an extending-out end of the material stacking rod is blocked outside the lower equipment of the silicon iron furnace through a blocking tool to drive the equipment to separate from the furnace body of the silicon iron furnace. The method is realized based on the device. By virtue of the device and the method, harm, caused by manual operation, on maintainers can be effectively avoided, working efficiency is improved, equipment maintenance time is greatly shortened, and therefore, the device and the method are safe and reliable.