The invention discloses a clean and high-efficiency gasification device, which aims to solve the problems of serious pollution, low heat efficiency and the like in the existing gasification furnace technology. The clean and high-efficiency gasification device comprises a furnace body, a charging device and an ash discharging device, wherein pressure-bearing interlayers are arranged in the furnace body; each pressure-bearing interlayer comprises a material-falling rod and a driver, and a porous partition board needs to be provided according the actual situation; the material-falling rod is driven by the driver to move to control the material-falling direction and speed and bear the pressure of the upper layer of a material; and the material falls into the space of the lower layer of the furnace body directly from the gap between the material-falling rods or through the porous partition board. The clean and high-efficiency gasification device has the beneficial effects that the pressure-bearing strength of the bottom layer of the material is reduced; and the layer height of a drying section and a destructive distillation section in the furnace body can be increased according to the actual requirement, in other words, a 'self-filtering system' of gasified gas is additionally arranged in the furnace body, so that smoke and tar of the gasified gas can be filtered out, the gasified gas outlet temperature can be reduced, the original materials can be dried, the heat efficacy of the gasification device can be obviously improved, and discharge of pollutants such as smoke and tar can be reduced.