A method of treatment and reducing the mass of landfilled municipal waste in one technological sequence, comprising the steps of waste shredding, biodrying, biostabilisation and separation of combustible SRF fraction, characterised in that: - the main waste stream goes to the waste treatment system; where - after initial shredding to a grain size of not more than 300 mm, the waste is subjected to the process of biodrying, in reactors with active aeration with an air flow in the range of 0.003-0.2 kg of air per kilogram of waste per hour, over a period not longer than 10 days, until obtaining a moisture of the waste of not less than 28%; - then, the waste stream is subjected to separation of metals through the use of magnetic and inductive separators; and then - the waste is separated mechanically on a sieve with a mesh size of not less than 80 mm into two streams: oversize fraction and undersize fraction which are subjected to further processing so that the oversize fraction is in the first place directed to manual sorting whereplastic and paper intended for material recycling are separated, then the remaining oversize fraction is processed into SRF with a calorific value in the range of 16 to 23 MJ/kg and a fragmentation of no more than 30 mm, whereas the undersize fraction separated on the sieve is subjected to the process of aerobic biostabilisation in reactors with active aeration with an air flow in the range of 0.0006-0.02 kg of air per kilogram of waste per hour, over a period not shorter than 14 days, with transferring by means of a loader, until obtaining organic matter content in the waste, expressed as ignition loss of less than 35% d.m., or as total organic carbon of less than 20 % d.m., or respiratory activity AT4 of less than 10 mgO 2 /g d.m.; - and then by means of a sieve with a mesh size of 20 mm, the fine undersize fraction with a grain size < 20 mm, having properties similar to the compost, intended for recovery, and oversize fraction with a grain size >20 mm, intended to be landfilled, is separated from the obtained stabilised compost. - the main waste stream goes to the waste treatment system; where - after initial shredding to a grain size of not more than 300 mm, the waste is subjected to the process of biodrying, in reactors with active aeration with an air flow in the range of 0.003-0.2 kg of air per kilogram of waste per hour, over a period not longer than 10 days, until obtaining a moisture of the waste of not less than 28%; - then, the waste stream is subjected to separation of metals through the use of magnetic and inductive separators; and then - the waste is separated mechanically on a sieve with a mesh size of not less than 80 mm into two streams: oversize fraction and undersize fraction which are subjected to further processing so that the oversize fraction is in the first place directed to manual sorting whereplastic and paper intended for material recycling are separated, then the remaining oversize fraction is processed into SRF with a calorific value in the range of 16 to 23 MJ/kg and a fragmentation of no more than 30 mm, whereas the undersize fraction separated on the sieve is subjected to the process of aerobic biostabilisation in reactors with active aeration with an air flow in the range of 0.0006-0.02 kg of air per kilogram of waste per hour, over a period not shorter than 14 days, with transferring by means of a loader, until obtaining organic matter content in the waste, expressed as ignition loss of less than 35% d.m., or as total organic carbon of less than 20 % d.m., or respiratory activity AT4 of less than 10 mgO 2 /g d.m.; - and then by means of a sieve with a mesh size of 20 mm, the fine undersize fraction with a grain size < 20 mm, having properties similar to the compost, intended for recovery, and oversize fraction with a grain size >20 mm, intended to be landfilled, is separated from the obtained stabilised compost.