Recycling system and method of high-salt high-COD soybean waste liquid

The invention provides a high-salt high-COD soybean waste liquid recycling system and method, and the system comprises a pretreatment system which is used for receiving waste liquid and removing suspended solids in the waste liquid to obtain raw water; the evaporation and concentration system is used for carrying out evaporation and concentration on the raw water to obtain a concentrated solution and evaporation condensate water; the spray drying system is used for performing spray drying on the concentrated solution to obtain a compound fertilizer matrix; the biochemical treatment system is used for carrying out biochemical treatment on the filtered water and the evaporation condensate water to obtain biochemical treatment water; the reverse osmosis membrane system is used for treating the biochemical treatment water subjected to biochemical treatment through a reverse osmosis membrane to obtain reuse water and concentrated water; the membrane concentration system is used for performing ...