The invention discloses a mixed cultivation medium applicable to turfgrass and application of the mixed cultivation medium. The mixed cultivation medium applicable to the turfgrass is prepared from sludge composting, soil and coal gangue in mass ratio of (2-4):(10-12):(4-7). The application of the mixed cultivation medium to the turfgrass comprises the following steps: paving on a ground; sowing the seeds of the turfgrass into the mixed cultivation medium applicable to the turfgrass; and cultivating to obtain the turfgrass. The mixed cultivation medium applicable to the turfgrass has the advantages that the turfgrass is a plant through the mixed cultivation medium, instead of soil, so that the land resource can be saved, and the pressure from the demand of urban greening on soil can be relieved; the sludge composting provides the nutrient required by the turfgrass, so that the fertilizer can be saved, the sludge can be effectively utilized, and meanwhile, toxic components can be prevented from entering the food chain; the raw materials are rich in source, so that the cost is low; the preparation method is simple; the turfgrass growing time is reduced; in addition, the turfglass cultivation effect is good; pretreatment is saved before seed sowing; the mixed cultivation medium can be widely popularized.