The invention relates to the technical field of building engineering auxiliary devices, and discloses a waste disposal device for building engineering. The device comprises a box body, a feeding opening is formed in the middle of the top of the box body fixedly, a fixed plate is fixedly mounted on one side of the box body, and a water pump is fixedly arranged on the top of the fixed plate. According to the waste disposal device for building engineering, through cooperative use of a fixed box, an electric push rod, a baffle, a magnet, a positive and reverse motor, a rotating rod, a thread cylinder, a limiting rod, a scraping plate and a vibration device, a telescopic rod can carry out attraction sorting on metal on waste, through the positive and reverse motor, the rotating rod, the threadcylinder, the limiting rod and the scraping plate, the metal on the magnet can be removed, collection is carried out through a collection box, the phenomenon that an existing waste disposal device cannot carry out sorting recycling on the metal, the metal material is broken, and a large amount of metal resources are wasted is avoided, and through a vibration device, sorting is more thorough.