An installation device with an externally-arranged silicone rubber plate comprises metal pressing plates, buffer parts and connection parts. Each buffer part comprises a flexible cushion. Each connection part comprises an inner side outward-turned flange of a rear gland. A connection bolt I of each connection part is connected to the inner side outward-turned flange of the corresponding rear gland after sequentially penetrating through the corresponding metal pressing plate, the corresponding flexible cushion and the silicone rubber plate. Each inner side outward-turned flange of the corresponding rear gland is located outside the corresponding rear gland. The rear glands are connected to an outer shell of a vibrating feeder through bolts. The installation device has the advantages that the movable rear gland is used in cooperation with the approximately-U-shaped rear gland, and therefore an operator does not need to enter the vibrating feeder when the silicone rubber plate is overhauled and installed, work efficiency is high, and potential hazards and dangers in internal work are eliminated.