A shielding cover mounting and dismounting apparatus for mounting or dismounting a shielding cover connected with a circuit board. The circuit board has an upper surface and a lower surface, and the shielding cover is connected with the lower surface. The apparatus includes a base, a first supporting seat, a second supporting seat, a heater and a moving seat. The first supporting seat is disposed on the base and has a bearing cavity. The shielding cover and the circuit board are disposed in the bearing cavity, and the shielding cover is disposed between the circuit board and a bottom surface of the bearing cavity. The second supporting seat is disposed in an opening of the bearing cavity. The heater is disposed at one side of the upper surface of the circuit board. The moving seat drives the heater to move closer to or away from the circuit board.