Biogas-slurry biological pesticide and preparation method thereof

The invention provides a biogas-slurry biological pesticide and a preparation method thereof, and relates to the technical field of agricultural resource utilization. The biogas-slurry biological pesticide is prepared from the following raw-material components in parts by volume: 60 to 80 parts of concentrated biogas slurry and 20 to 40 parts of plant extracting solution, wherein the sum of the volumes of the concentrated biogas slurry and the plant extracting solution is 100 parts; and the plant extracting solution is prepared from at least one of a cortex phellodendri chinensis extracting solution, a bulbus allii sativi extracting solution, a walnut leaf extracting solution, a radix sophorae flavescentis extracting solution, a rhizoma coptidis extracting solution, an onion extraction solution and a cigarettes and tobacco extracting solution. The biogas-slurry biological pesticide provided by the invention contains a plurality of active components and is high in content; the components synergetically coopera