Water leakage prevention structure for deformation joint of building

The utility model relates to a building deformation joint water leakage prevention structure which is installed in a deformation joint between two structural beams, the water leakage prevention structure comprises a first sealing assembly, a second sealing assembly and a drainage assembly, the first sealing assembly is fixedly installed in an installation groove of the structural beam and seals the deformation joint, and the second sealing assembly is fixedly installed in an installation groove of the structural beam. The second sealing assembly comprises a water stop belt, the water stop belt is fixedly installed in a gap between the first sealing assembly and the installation groove and located below the first sealing assembly, the drainage assembly comprises a water collecting piece and a drainage pipe, the water collecting piece is fixedly installed on the two structural beams, and the drainage pipe is located below the water collecting piece. The water collecting piece is located below the water stop bel