Working electrolyte solution of 800 V aluminum electrolytic capacitor and preparation method of working electrolyte solution

The invention discloses a working electrolyte solution of an 800 V aluminum electrolytic capacitor. The working electrolyte solution comprises, by weight, 30%-65% of main solvent, 10%-35% of auxiliary solvent, 5%-25% of solute, 5%-15% of spark voltage improver and 1.5%-3.5% of additives. The invention further discloses a preparation method of the working electrolyte solution. The working electrolyte solution makes a 700 V-750 V superhigh voltage technical breakthrough and can directly reach the 800 V superhigh voltage technical field, and the working electrolyte solution has the advantages of being high in working voltage, long in service life, stable in performance under a high temperature environment, good in pressure resistance of products, good in gas production performance and the like.