NOVELTY - Producing liquid fertilizer comprising removing a solid substance containing living organism decomposition-resistant component from organic waste (1) containing livestock forming excretion, by preprocessing waste liquid (3), where anaerobic fermentation of liquid (3) is carried out to produce liquid fertilizer and an iron chloride (5) is added to fertilizer, sulfur component is dissociated, fixed as iron sulfide and liquid fertilizer (9) is obtained, is new.    USE - For producing liquid fertilizer (claimed).    ADVANTAGE - The manufacturing method provides high quality liquid fertilizer having homogenized characteristics, without production of scum. The manufacturing method prevents bad smell from decomposition product of living organism decomposition-resistant component and a hydrogen gas sulfide, growth inhibition or rice plant by hydrogen sulfide and sulfide ion, and suppresses suspended solid concentration in liquid fertilizer after anaerobic fermentation.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for producing apparatus of the liquid fertilizer. The apparatus has a pre-processing unit (2) to separate and remove the solid substance containing living organism decomposition-resistant component from organic waste (1), and an iron solution supply unit (4) to carry out anaerobic fermentation of waste liquid and to add iron chloride solution (5) to liquid fertilizer, anaerobic fermenter (8) and auxiliary addition unit (6) to add plant-derived phosphoric acid group organic compound (7) to waste liquid, and a storage tank (10) to store liquid fertilizer from the anaerobic fermenter and to return liquid fertilizer to aerobic state.    DESCRIPTION OF DRAWING(S) - The figure shows the block diagram of the manufacturing apparatus of liquid fertilizer. (Drawing includes non-English language text).    Organic waste (1)    Pre-processing unit (2)    Waste liquid (3)    Iron solution supply unit (4)    Iron chloride solution (5)    Auxiliary addition unit (6)    Phosphoric acid group organic compound (7)    Anaerobic fermenter (8)    Liquid fertilizer (9)    Storage tank (10)