The invention discloses a recovery and reutilization method of an ethanol-hydrazine hydrate mixed solution in pyraclostrobin production. The method comprises the following steps: (1) adding raw materials into a flash evaporator, wherein the vapor phase rises to the tower top, and the liquid-phase high-boiling-point organic matters enter a bottom collecting tank and are discharged periodically; (2) adding a mixed extractant into an extraction rectification tower, and introducing the vapor phase into the extraction rectification tower to perform extraction rectification separation, thereby obtaining ethanol on the tower top and obtaining a mixed extractant containing hydrazine hydrate and water on the tower bottom; (3) adding the mixed extractant into a solvent regeneration tower to perform regeneration so as to obtain the mixed extractant on the bottom of the regeneration tower, introducing the mixed extractant into the extraction rectification tower for reutilization, and obtaining a hydrazine-hydrate-containing water solution on the tower top; and (4) adding the hydrazine-hydrate-containing water solution into an azeotropy rectification tower, adding a mixed azeotrope former from the top of the azeotropy rectification tower, distilling out water from the tower top, and obtaining the hydrazine hydrate at the tower bottom, wherein the mixed azeotrope former forms an internal circulation in the azeotropy rectification tower. Compared with the prior art, the method only needs single extraction rectification and single azeotropy rectification, and thus, is simple in technique and can efficiently recover and utilize the raw materials.