A method of producing hydrocarbon fuels from polyolefin waste materials, wherein: - polyolefin waste materials are subjected to continuous depolymerisation in a tower flow reactor with a movable packing, which comprises a heating system for heating the lower half of a reaction chamber, where products of the depolymerisation are collected in a gaseous state through an outlet in the upper half of the reaction chamber; - and the obtained products of the depolymerisation are subjected to catalytic hydrogenation and isomerisation in an atmosphere of synthesis gas, under atmospheric pressure, resulting in a mixture of hydrocarbon fuels; characterised in that: - the cleansed, rinsed with nitrogen and ground polyolefin waste materials are mixed with heated elements constituting the packing of the reactor, for a time period necessary for plasticisation, and until the surface of the packing elements is coated with a thin layer of plasticised material, wherein the average temperature of the mixture is within the range of 240 to 260°C, and wherein in the depolymerisation process, which is carried out under atmospheric pressure, the obtained mixture is fed as a stream into the reaction chamber from the top of the chamber, whereas a synthesis gas is fed in a counter-current from the bottom, the gas comprises carbon monoxide (CO) and hydrogen (H 2 ), with the CO:H 2 molar ratio from 0.25 to 1.5 : from 0.5 to 3, wherein in the depolymerisation process, the temperature of the lower half of the reaction chamber ranges from 400 to 440°C, while the temperature near the outlet for depolymerisation products is maintained in the range from 200 to 360°C. - polyolefin waste materials are subjected to continuous depolymerisation in a tower flow reactor with a movable packing, which comprises a heating system for heating the lower half of a reaction chamber, where products of the depolymerisation are collected in a gaseous state through an outlet in the upper half of the reaction chamber; - and the obtained products of the depolymerisation are subjected to catalytic hydrogenation and isomerisation in an atmosphere of synthesis gas, under atmospheric pressure, resulting in a mixture of hydrocarbon fuels; - the cleansed, rinsed with nitrogen and ground polyolefin waste materials are mixed with heated elements constituting the packing of the reactor, for a time period necessary for plasticisation, and until the surface of the packing elements is coated with a thin layer of plasticised material, wherein the average temperature of the mixture is within the range of 240 to 260°C, and wherein in the depolymerisation process, which is carried out under atmospheric pressure, the obtained mixture is fed as a stream into the reaction chamber from the top of the chamber, whereas a synthesis gas is fed in a counter-current from the bottom, the gas comprises carbon monoxide (CO) and hydrogen (H 2 ), with the CO:H 2 molar ratio from 0.25 to 1.5 : from 0.5 to 3, wherein in the depolymerisation process, the temperature of the lower half of the reaction chamber ranges from 400 to 440°C, while the temperature near the outlet for depolymerisation products is maintained in the range from 200 to 360°C. <EOS>