Lightweight planting soil as well as preparation method and application thereof

The invention provides light-weight planting soil and a preparation method and application thereof.The light-weight planting soil is prepared by mixing self-made light-weight nutrient soil, ceramsite and volcanic rock, the adding proportion of all the raw materials is adjusted in a targeted mode, and therefore the prepared light-weight planting soil is suitable for growth of various plants, and it is detected that the light-weight planting soil has a good application prospect. The saturated water volume weight of the light planting soil can be lower than 600 kg/m, the drainage rate can reach 200 mm/h, the water-holding capacity is high and can reach 160% or above, compared with conventional soil, the use amount and depth of the soil can be reduced, plants can grow well, the light planting soil is used for house planting, greening can be achieved in a limited space, land resource occupation is reduced, the roof load requirement is effectively reduced, and the light planting soil is suitable for being used for