The utility model relates to an installation assembly of a large power discrete component. The installation assembly comprises the large power discrete component, a circuit board, and a heat radiation mechanism, wherein pins of the large power discrete component are electrically connected to the circuit board, the pins of the large power discrete component are sleeved by a pin isolation groove element, the pin isolation groove element comprises a frame main body, the frame main body is provided with a pin accommodation chamber, insulation isolation boards for isolating the pins are disposed in the pin accommodation chamber, the pin accommodation chamber on the frame main body is divided into a plurality of independent pin isolation chambers through the insulation isolation boards, the pins of the large power discrete component are fixed in the pin isolation chambers respectively in a stretching manner. The installation assembly is reasonable in design, compact in structure, long in service life, and good in performance. The processing and forming tool of the installation assembly is easily available, and theinstallation assembly has relatively low requirement on the processing environment. The installation assembly has characteristics of being moistureproof, being anticorrosion, being dustproof, being antistatic, and being shockproof.