New type of self-compactingconcrete with a reduced clinker factor (Eco-SCC) is proposed. Increased rheological properties of concrete mixtures, as well as high early strength of low-carbon self-compacting concrete are achieved by using nanomodified cementitious systems “Portland cement - microfiller - superplasticizer - nanomodifier - alkaline hardening accelerator”. The developed self-compacting concrete mixtures are characterized by the following indicators: SF2 class (720 mm), spreading time t500 = 4.9 s, which corresponds to VS2 viscosity class; compressive strength after 2 days is 32.7 MPa, after 28 days - 44.7 MPa (fcm2/fcm28 = 0.73). In this case, the clinker intensity is 5.61 kg/MPa·m3 and the CO2 intensity is 4.8 kg/MPa·m3. The positive effect of polymer fibre reinforcement on the characteristics of Eco-SCC was established. The specific impact energy before the first crack appeared after 28 days of curing was 1.08 J/cm3 in unreinforced concrete. The addition of 0.6 mass.% of fibres increases the specific impact energy until the samples are completely destroyed to 1.88 J/cm3. Developed low-carbon self-compacting fibre-reinforced concrete based on nanomodified cementitious systems meets Eco-SCC requirements, which allow to reduce the material consumption of the construction and labour costs for laying concrete mix and reduce the negative impact on the environment.