The invention relates to the field of low-voltage power supply facilities, and discloses a large-capacity intelligent phase-change switch which has larger load capacity, is high in integration and intelligence and is more suitable for processing and mass production. The large-capacity intelligent phase-change switch comprises a top casing, a bottom casing and a bottom plate which are installed inorder from front to back, the surface of the top casing is provided with a display control board, the center of the bottom casing is fixed with a motor, the rotation shaft of the motor is connected with an electromagnetic relay, the top portion of the electromagnetic relay is provided with an angle sensor, a main control board and a power module are fixed in the bottom casing, at least one set ofmoving contacts are uniformly distributed at the outer circumference of the electromagnetic relay, one sides of the moving contacts are provided with an opening detection circuit, the lower portions of the moving contacts are provided with locking sliding pieces, the inner sides of the locking sliding pieces are provided with trip assemblies, the moving contacts pass through moving contact supports, the moving contact supports are fixed on the bottom casing, and the outer sides of the moving contact supports are provided with fixed contacts corresponding to the moving contacts.