A hopper device comprises a hopper, a hopper cap which lies under the hopper and can rotate corresponding to the hopper. The utility model protects conveyer from pressing and deforming and avoids iron ore from spreading out of the conveyer, further can adjust falling flow of the iron core and artificially control the convey and iron ore collection speed. When the iron ore is wet, lumps and doesn't flow downwards in the rainy day, the integral hopper device is dragged to ball out the lumped iron ore on the top conveniently.