The invention discloses a sand screening device for constructional engineering. The sand screening device for the constructional engineering comprises a bottom plate, a screen net, a sand screening box, a second motor, a second threaded rod, a second sleeve, a connection rod, a third motor, a crankshaft, a linking rod, a rotating shaft, a fourth motor, a third gear, a fourth gear, a spring, a stirring rod, a shredding ball, a conical material dividing plate, a magnet and an iron sheet. The sand screening device for constructional engineering is provided with a first motor, a first gear, firstsleeves and first threaded rods, the whole device is fixed, and equipment damage and a safety accident caused by toppling and falling of the device are avoided; the second motor, a second sleeve, a second threaded rod and the connection rod are arranged, the sand screening box is made to incline, discharging is facilitated, sand which cakes because of moisture is smashed, and it is avoided that the screening efficiency is affected; meanwhile, falling sand is uniformly thrown to the periphery through the conical material dividing plate, sufficient and uniform screening is performed, and it is avoided that the sand is accumulated at one position of the screen net and the screening speed is decreased; and the magnet, the iron sheet and a spring are arranged, the screen net is made to shake violently, and the screening efficiency is improved.