Cone-bottomed cylindrical silo for storing granular and powdery materials. One-half of the cone angle at the bottom of the silo must be greater than the static angle of repose. Factors that cause adhesion (or affinity) between the material particles and between the material and the warehouse floor, so that all the materials cannot flow out of the warehouse, and a part of it remains on the warehouse bottom, which needs to be cleaned out manually. If the warehouse is cleared manually, people cannot stand on the slope of the warehouse bottom naturally due to the large slope of the cone-bottom warehouse, so the warehouse clearance operation cannot be performed. It is very unsafe to use ropes for manual work, even if it is a springboard.