Protection device for building electrical installation pre-embedded wire pipe

The invention belongs to the technical field of electrical wires, and particularly relates to a protection device for a building electrical installation pre-embedded wire pipe, which comprises four sleeves, a hose; mounting seats are arranged at the tops of the four fixing seats; by rotating a fastening nut, rotating the fastening nut outwards and releasing fixing of a rotating plate, the rotating plate rotates around a pin shaft under the action of a first spring, the rotating plate drives a first gear ring to rotate towards the outer side, so that matching with a second gear ring is released, a second rotating rod can be rotated, and when the second rotating rod rotates to a proper angle, the second rotating rod can rotate to the proper angle. The fastening nut is reversely rotated, the fastening nut rotates inwards, the rotating plate is extruded, the rotating plate rotates around the pin shaft to the inner side, the first spring contracts, the rotating plate drives the first gear ring to rotate towards th