The present invention relates to an environmentally friendly road improvement mixture and a cold environment-friendly road improvement method. The road improvement mixture is characterized by 35-65 parts by weight of crushed gravel, 30-60 parts by weight of washed steel slag, 1-2 parts by weight of cement, 10-15 parts by weight of polymer-modified cationic bitumen emulsion with a dry matter content of at least 40%, 1.5-8 parts by weight of water and 0 to 5 parts by weight of rubber flour with a particle size of less than 1 mm. The road repair process according to the invention is characterized in that 35 to 65 parts by weight of crushed gravel and 30 to 60 parts by weight of washed steel slag, 1 to 2 parts by weight of cement are formed into a stone frame, to which 1.5 to 8 parts by weight of water are added, followed by 12 to 15 parts by weight of at least 40 parts by weight of dry matter. polymer-modified cationic bitumen emulsion containing, if appropriate, up to 5 parts by weight of rubber grit with a particle size of less than 1 mm is mixed, the mortar thus produced is homogenized and ŕ
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