The invention discloses a device and a method for hot loading of metallized pellets of a rotary hearth furnace into a blast furnace. The device comprises the rotary hearth furnace, the blast furnace, an intermediate bin, a belt scale and a feeding belt system. The method comprises the following steps of: delivering high-temperature (between 900 and 1,100 DEG C) metallized pellets produced from the rotary hearth furnace to the intermediate bin through a high temperature-resistant chain plate for preserving heat and storing; controlling the feeding velocity according to the proportion of furnace burdens for the production of the blast furnace, and metering materials through the belt scale when a feeding belt on the blast furnace feeds the materials; distributing sintering ore on the feeding belt; distributing the high-temperature metallized pellets when the sintering ore on the feeding belt is delivered to the intermediate bin; and distributing lump ore and oxidized pellets sequentially when delivering the high-temperature metallized pellets to a lump ore bin and an oxidized pellet bin. According to the device and the method, the furnace burdens on the belt are distributed on the feeding belt layer by layer according to the sequence of sintering, and distributing the high-temperature metallized pellets, the lump ore and the pellets, so that the waste heat of the high-temperature metallized pellets is fully used; and the low-temperature sintering ore is used as a grate-layer material, so that the service life of the feeding belt is prolonged.