The invention provides a multi-stage sealing transformation feeding system. The multi-stage sealing transformation feeding system comprises a power device, a connecting rod, pistons, a conveying pipeline, a pressure reducing valve, a filtering device, a feeding opening and a discharging opening. All the pistons are connected in the conveying pipeline through the connecting rod to form a plurality of movable sealing chambers and are driven by the power device to carry out reciprocating motion. When the sealing chambers pass through the feeding opening, materials are added; when the sealing chambers pass through the discharging opening, the materials are fully mixed with high-pressure gas in a high-pressure material bin, have the properties of fluid and fall into the discharging opening under the action of gravity. When the sealing chambers run to a reciprocating motion extreme position and then return to the discharging opening, the pressures of the sealing chambers and the high-pressure material bin are balanced, and the remaining materials in the sealing chambers fall into the discharging opening under the action of the gravity. The no-load sealing chambers continuously run, and when the no-load sealing chambers pass through the pressure reducing valve, the pressure is reduced to the normal pressure; the sealing chambers return to the feeding opening for next-round feeding.