The invention discloses a movable minitype medium-low radioactive waste gasification and melting treatment system and method thereof. The movable minitype medium-low radioactive waste gasification andmelting treatment system comprises a crusher, a pneumatic diaphragm pump, a plasma gasification and melting furnace, a melting vitreous body receiver, a burning chamber, a primary direct heat exchanger, a ceramic filter, a secondary direct heat exchange, an activated carbon adsorption tower, a deacidification washing tower, an efficient air filter, a chimney and mobile equipment. The waste is subjected to pretreatment and is conveyed into the plasma gasification and melting furnace, and then gasification reaction is carried out in an in-furnace gasification area so as to produce synthetic gas; the synthetic gas is introduced into the burning chamber, is fully burned and decomposed, and then is fed into a flue gas purification treatment system; ash residues enter into a melting area and are subjected to vitrification melting treatment so that radioactive nuclide is fixed in a melting vitreous body, and the vitreous body is cooled, is barreled and stored by an automatic receiving systemand is subjected to landfilling in a near surface area of a medium-low radioactive waste landfill. The movable minitype medium-low radioactive waste gasification and melting treatment system disclosed by the invention has the advantages of being good in volume reduction effect, high in safety and reliability, high in nuclide stability and high in process integration of the system.