The invention relates to the technical field of plant cultivation substrates, in particular to a high-heat-preservation substrate for recovery of broken hill vegetation in a high elevation region. 45-50% by volume of sand loam, 35-40% by volume of highland barley straw, 3-6% by volume of organic fertilizer, 0.01-0.03% by volume of pellet agent, 0.01-0.03% by volume of polyvinyl acetate, 0.01-0.03%by volume of sodium carboxymethylcellulose, 2-4% by volume of humic acid, 2-4% by volume of liquid emulsified asphalt and 0.03-0.10% by volume of plant seeds are taken, the substrate thickness is 2-6cm, the highland barley straw particle size is 2-4 cm, the organic fertilizer is faeces of Tibetan-sheep and yaks, highland barley straw and rape stalk with the particle size smaller than 4 cm, faeces and the stalk are mixed according to the volume ratio being 1:(1-3) and then subjected to composting fermentation, the composting time is from October to April the following year, turning and ventilation are conducted semimonthly, film mulching is used for covering at night, the fermentation temperature is maintained, and the seeds comprise one or multiple of pennisetum centrasiaticum, orinus thoroldii (Stapf ex Hemsl.) bor, rrtemisia wellbyi Hemsl. et Pears. ex deasy, oxytropis sericopetala, rhododendron nivale and sabina chinensis. The substrate has the advantages of being high in heat preservation, capable of prolonging plant growth time, resistant to washout, good in water-retaining property and capable of increasing the broken hill coverage rate.