Solid tantalum capacitor and its manufacturing process, including tantalum capacitor body, tantalum capacitor body including tantalum core, anode lead-out plate, cathode lead, metal shell and glass powder insulator, multiple tantalum cores are sequentially fixed on the metal shell by tin solder or conductive silver paste Among them, the metal shell is encapsulated by a glass powder insulator, the anode lead-out plate is installed in the metal shell and is located between the glass powder insulator and the tantalum core, the anode wire of the anode lead-out plate passes through the glass powder insulator as the anode lead of the capacitor, and the cathode lead is inserted into the metal In the shell and welded with the glass powder insulator and the metal shell, the tantalum core is a porous matrix formed by pressing a cuboid made of high-volume tantalum powder and sintered under high-temperature vacuum, and the tantalum core is covered by electroplating, coating or impregnation. There is a conductive polymer layer, and the tantalum core has jagged sides with alternating convex and concave. The invention greatly reduces the ESR value of the capacitor while the capacitor provides a large capacitance, and the reliability of the capacitor is higher.