Railway subway signal relay shielding device

The utility model discloses a railway subway signal relay shielding device which comprises a bottom plate, supporting legs are arranged at the bottom of the bottom plate, and a signal relay body is placed on the bottom plate. Cuboid-shaped pin joint columns are arranged at four corners above the bottom plate, through holes are formed in the tops of the pin joint columns in a penetrating mode, a dustproof cover is movably installed on the bottom plate, and the inner side walls of the four corners of the dustproof cover are in contact connection with the outer walls of the pin joint columns; a through hole is formed in the top of the dustproof cover in a penetrating mode, and a hollow cuboid-shaped protrusion is arranged in the middle of the top wall of the dustproof cover. A mounting frame is movably connected to the dustproof cover, a ventilation net is arranged on the inner side of the top of the mounting frame, a ventilation structure is arranged below the ventilation net, a threaded column and a top plate