Isolation screen sealing structure for chiseling off side wall at joint of existing subway line and transfer channel

The utility model discloses an isolation screen sealing structure for chiseling off a side wall at the joint of an existing subway line and a transfer channel, which adopts a profiled steel sheet, a supporting framework and a sound insulation cotton layer to form a composite baffle plate, and a waterproof reverse ridge is firstly built on a floor of the existing subway line channel to prevent muddy water generated by chiseling off the side wall from overflowing into the existing subway line channel; a horizontal mortar layer is arranged at the root of the waterproof reverse ridge to block a gap between the waterproof reverse ridge and the floor, the upper portion and the lower portion of the composite baffle are connected with the waterproof reverse ridge and the top plate to form a totally-closed isolation screen sealing structure, and muddy water generated by chiseling off the side wall is prevented from overflowing into an existing subway line channel. Noise generated by chiseling off the side wall is bloc