The present invention provides a complex liquid fertilizer and a method for producing the same. (S 110) finely grinding the sericite and collecting it in a size of 300 to 400 mesh to prepare a particulate sericite; An aqueous solution treatment step (S 120) of mixing the monolithic sericite with 10 parts by weight of water and 20 parts by weight to 40 parts by weight of water and stirring the mixture for 2 hours to 3 hours and taking a supernatant; A step (S 130) of concentrating the aqueous solution of the sericite to conduct the primary filtration of the supernatant liquid, followed by secondary filtration and concentration; A post-treatment step (S 140) of concentrating the final liquid fertilizer by adding 0.5 to 5 parts by weight of microalgae to 100 parts by weight of the concentrated aqueous solution of the sericite; / RTI It is preferable that the microalgae are cultivated using various domestic sewage generated in an urbanized and industrialized area as a nutrient source and obtained through a photobioreactor. The present invention can supply plants with various minerals, especially calcium, sodium and iron, which are insufficient in the soil, and organic nutrients and vitamins such as proteins and lipids produced by microalgae, which can not be supplied by conventional liquid fertilizers Can be supplied at the same time.
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