Solid electrolytic capacitor and manufacturing method thereof

The invention provides a solid electrolytic capacitor and a manufacturing method thereof. The solid electrolytic capacitor comprises a valve metal anode body; a dielectric layer membrane which is formed on the valve metal anode body; and a cathode layer which is formed at the external side of the dielectric layer membrane. The solid electrolytic capacitor is characterized in that thickness of the dielectric layer membrane of the marginal area of the valve metal anode body is greater than that of the non-marginal area. According to solid electrolytic capacitor, thickness of the dielectric layer membrane of the marginal area of the valve metal anode body is greater than that of the non-marginal area so that leakage current can be reduced, leakage current is ensured to be stable under the situation of thermal stress relaxation and leakage current performance is ensured to be great under the situation of high-temperature and high-humidity loads.