The invention relates to a feeding device of dry-method grinding equipment and a disassembling and assembling method of the feeding device, in particular to a detachable multifunctional feeding device of the dry-method grinding equipment and a disassembling and assembling method of the detachable multifunctional feeding device. A horizontal feeding articulated chute is provided, two combined type hoppers with different gradients are arranged in the feeding articulated chute and are in butt joint with each other, and each combined type hopper is composed of a U-shaped wear-resisting component and wear-resisting side plates. Each U-shaped wear-resisting component is composed of a bottom plate, lateral plates arranged on the two sides of the back of the bottom plate and reinforcing rib plates arranged between the bottom plate and the lateral plates. The corresponding wear-resisting side plates are arranged on the two sides of the front face of each bottom plate. The two combined type hoppers are detachably connected with two fixing plates arranged in the feeding articulated chute through the respective wear-resisting side plates, the respective lateral plates and multiple bolts with tenons. By dismantling the bolts with the tenons for connecting the U-shaped wear-resisting components of the combined type hoppers and the fixing plates, parts, prone to being abraded, of the feeding device can be disassembled and replaced. According to the detachable multifunctional feeding device and the disassembling and assembling method thereof, the parts, prone to being abraded, of the feeding device can be conveniently disassembled and replaced, and the feeding device can become a channel for repairing staff to enter a grinding bin.