Biomass nutrient solution and preparation method thereof

The invention discloses a biomass nutrient solution and a preparation method thereof, and belongs to the technical field of agricultural nutrient solutions, wherein crop straw and salvia miltiorrhiza powder are ground and pulped to obtain a pretreatment raw material, and the pretreatment raw material is sequentially subjected to primary degradation, secondary degradation, pyrolysis and tertiary degradation to obtain a degradation product, medium trace elements are added into the degradation product, the pH value and the C/N ratio are adjusted, and a biomass nutrient solution is obtained after solid-liquid separation; according to the biomass nutrient solution prepared by the invention, the pH value, quick-acting potassium and salt content of soil are effectively reduced, and the reduction amplitude of the salt content reaches 29%; the contents of total nitrogen, available phosphorus and soil organic matters are increased, and the content of the organic matters in the soil is increased by 40% compared with tha