Plant culture medium as well as preparation method and application thereof

The invention discloses a plant culture medium as well as a preparation method and application thereof. The culture medium comprises the following components in parts by mass: 20-65 parts of wormcast; 5 to 25 parts of humic acid; 5-25 parts of fire soil ash and/or coal cinder; 5 to 20 parts of peat; 5-20 parts of coco coir; 5-12 parts of carbonized rice husk; 2 to 10 parts of perlite; 2 to 10 parts of vermiculite; 1-8 parts of cow dung compost; 0.5-5 parts of a calcium magnesium phosphate fertilizer; 0.1-5 parts of a long-acting slow-release compound fertilizer; 0.05 to 2 parts of amino acid; 0.05 to 0.5 part of composite salt containing medium trace elements; and 0.2-5 parts of a microbial agent. The culture medium can quickly and effectively improve foundation pit soil, improve soil fertility, increase organic matter and nutrient content of the soil, maintain the micro-ecological environment of the soil, improve the survival rate and growth and reproduction of green plants, avoid manpower, material and fina