Method for producing liquid chemical fertilizer by using yeast residues

The invention provides a method for producing a liquid chemical fertilizer by using yeast residues, and belongs to the technical field of liquid chemical fertilizers. According to the method for producing the liquid chemical fertilizer by using the yeast residues, a fermentation device comprises a tank body, a stirring mechanism, an oxygenation mechanism and a feeding mechanism, wherein a first motor is fixedly mounted at the top of the tank body. By arranging the oxygenation mechanism, a driving wheel can be driven to rotate through a first motor, and a supporting rod can be driven to reciprocate through a non-circle-center connecting rod, so that a piston rotationally connected with the supporting rod is driven to reciprocate in an inner cavity of the gas collecting tank, and gas in the inner cavity of the gas collecting tank is extruded; when the first motor drives the supporting rod to drive the piston to move towards the bottom of the gas collection tank, gas in the inner cavity of the gas collection tan