Slurry leakage prevention concealed type plastic mounting box for building

The utility model relates to the technical field of building electrical installation equipment accessory devices, in particular to a slurry leakage prevention concealed installation type plastic installation box for buildings, which comprises a box body, an installation plate, a sealing ring and a socket piece, a through hole is arranged on the side wall of the box body, the installation plate is arranged in the box body, an installation groove is arranged on the installation plate, and the sealing ring is arranged in the installation groove. The installation groove and the through hole are coaxially arranged, the sealing ring is installed on the installation plate and located on the outer edge of the installation groove, the sealing ring is located between the installation plate and the box body, one end of the socket piece is detachably installed in the installation groove in a plugging mode, the other end of the socket piece penetrates through the through hole and extends towards the outside of the box bod