The invention discloses a high-temperature-resistant long-service-life aluminum electrolytic capacitor, which comprises a core cladding, a shell arranged outside the core cladding, and colloidal particles covering the core cladding and used for sealing the shell, and is characterized in that the core cladding adsorbs electrolyte; the electrolyte is composed of a solvent, a solute and an additive,wherein the solvent of the electrolyte is ethylene glycol; the solute of the electrolyte comprises ammonium hydrogen azelate, ammonium dodecanedioate, diammonium hydrogen citrate and ammonium isosebacate; the additives comprise ammonium p-nitrobenzoate, p-nitrophenol, monobutyl phosphate, ammonium hypophosphite, nano silicon dioxide, polyethylene oxide ether, 8-hydroxyquinoline and polyborate. Through the electrolyte, the temperature resistance of the electrolyte can be improved, volatilization of the electrolyte at a high temperature is reduced, saturated vapor pressure is reduced, the conductivity of the electrolyte is improved, DF and ESR values of the capacitor are reduced, spontaneous heating in the capacitor is reduced, the high-voltage aluminum electrolytic capacitor can resist a high temperature of 115 DEG C or above, and the service life of the high-voltage aluminum electrolytic capacitor is guaranteed.